0.03/0.07 c SAT4J: a SATisfiability library for Java (c) 2004-2006 Daniel Le Berre
0.03/0.07 c This is free software under the GNU LGPL licence. See www.sat4j.org for details.
0.03/0.07 c This software uses some libraries from the Jakarta project. See jakarta.apache.org for details.
0.03/0.07 c no version file found!!!
0.03/0.07 c sun.arch.data.model 64
0.03/0.07 c java.version 1.6.0_24
0.03/0.07 c os.name Linux
0.03/0.07 c os.version 2.6.32-71.29.1.el6.x86_64
0.03/0.07 c os.arch amd64
0.03/0.07 c Free memory 1599470296
0.03/0.07 c Max memory 1607860224
0.03/0.07 c Total memory 1607860224
0.03/0.07 c Number of processors 8
0.10/0.10 --- Begin Solver configuration ---
0.10/0.10 c Stops conflict analysis at the first Unique Implication Point
0.10/0.10 c org.sat4j.minisat.constraints.PBMaxClauseCardConstrDataStructure@18e2b22
0.10/0.10 c Learn all clauses as in MiniSAT
0.10/0.10 c claDecay=0.999 varDecay=0.95 conflictBoundIncFactor=1.5 initConflictBound=100
0.10/0.10 c VSIDS like heuristics from MiniSAT using a heap
0.10/0.10 c No reason simplification
0.10/0.10 c --- End Solver configuration ---
0.10/0.10 c solving HOME/instance-3732627-1338691133.opb
0.10/0.10 c reading problem ...
0.10/0.18 c ... done. Wall clock time 0.084s.
0.10/0.18 c CPU time (experimental) 0.16s.
0.10/0.18 c #vars 400
0.10/0.18 c #constraints 600
0.25/0.21 c SATISFIABLE
0.25/0.21 c OPTIMIZING...
0.25/0.21 c Got one! Elapsed wall clock time (in seconds):0.118
0.25/0.22 o 200
0.25/0.22 c starts : 1
0.25/0.22 c conflicts : 62
0.25/0.22 c decisions : 473
0.25/0.22 c propagations : 3204
0.25/0.22 c inspects : 4731
0.25/0.22 c learnt literals : 8
0.25/0.22 c learnt binary clauses : 14
0.25/0.22 c learnt ternary clauses : 30
0.25/0.22 c learnt clauses : 54
0.25/0.22 c root simplifications : 0
0.25/0.22 c removed literals (reason simplification) : 0
0.25/0.22 c reason swapping (by a shorter reason) : 0
0.25/0.22 c Calls to reduceDB : 0
0.25/0.22 c speed (decisions/second) : 13138.88888888889
0.25/0.22 c non guided choices 0
0.25/0.22 s OPTIMUM FOUND
0.25/0.22 v x1 -x2 -x3 x4 x5 -x6 x7 -x8 x9 -x10 -x11 x12 -x13 x14 x15 -x16 -x17 x18 x19 -x20 -x21 x22 x23 -x24 x25 -x26 x27 -x28 x29 -x30 -x31 x32 x33 -x34 x35 -x36 -x37 x38 x39 -x40 x41 -x42 -x43 x44 x45 -x46 x47 -x48 -x49 x50 x51 -x52 x53 -x54 x55 -x56 x57 -x58 -x59 x60 -x61 x62 -x63 x64 -x65 x66 -x67 x68 x69 -x70 x71 -x72 x73 -x74 -x75 x76 -x77 x78 -x79 x80 -x81 x82 x83 -x84 -x85 x86 -x87 x88 -x89 x90 -x91 x92 x93 -x94 x95 -x96 x97 -x98 -x99 x100 x101 -x102 -x103 x104 -x105 x106 -x107 x108 -x109 x110 x111 -x112 -x113 x114 -x115 x116 -x117 x118 x119 -x120 -x121 x122 -x123 x124 x125 -x126 x127 -x128 -x129 x130 x131 -x132 -x133 x134 -x135 x136 -x137 x138 -x139 x140 x141 -x142 -x143 x144 x145 -x146 x147 -x148 -x149 x150 -x151 x152 -x153 x154 x155 -x156 -x157 x158 x159 -x160 -x161 x162 -x163 x164 -x165 x166 x167 -x168 -x169 x170 x171 -x172 x173 -x174 x175 -x176 -x177 x178 x179 -x180 -x181 x182 x183 -x184 x185 -x186 -x187 x188 -x189 x190 x191 -x192 x193 -x194 x195 -x196 x197 -x198 -x199 x200 x201 -x202 x203 -x204 -x205 x206 x207 -x208 -x209 x210 -x211 x212 -x213 x214 -x215 x216 x217 -x218 x219 -x220 x221 -x222 x223 -x224 -x225 x226 -x227 x228 x229 -x230 x231 -x232 x233 -x234 x235 -x236 -x237 x238 -x239 x240 -x241 x242 -x243 x244 x245 -x246 x247 -x248 x249 -x250 -x251 x252 -x253 x254 -x255 x256 -x257 x258 -x259 x260 x261 -x262 x263 -x264 -x265 x266 -x267 x268 x269 -x270 -x271 x272 x273 -x274 -x275 x276 x277 -x278 -x279 x280 -x281 x282 x283 -x284 -x285 x286 -x287 x288 -x289 x290 x291 -x292 x293 -x294 -x295 x296 -x297 x298 -x299 x300 -x301 x302 x303 -x304 x305 -x306 x307 -x308 -x309 x310 -x311 x312 -x313 x314 x315 -x316 x317 -x318 -x319 x320 x321 -x322 x323 -x324 x325 -x326 -x327 x328 x329 -x330 -x331 x332 x333 -x334 -x335 x336 -x337 x338 -x339 x340 x341 -x342 -x343 x344 -x345 x346 x347 -x348 x349 -x350 -x351 x352 x353 -x354 -x355 x356 -x357 x358 x359 -x360 x361 -x362 x363 -x364 -x365 x366 x367 -x368 -x369 x370 -x371 x372 x373 -x374 x375 -x376 -x377 x378 -x379 x380 x381 -x382 -x383 x384 x385 -x386 x387 -x388 -x389 x390 x391 -x392 -x393 x394 -x395 x396 x397 -x398 -x399 x400
0.25/0.22 c objective function=200
0.25/0.22 c Total wall clock time (ms): 0.128
runsolver Copyright (C) 2010-2011 Olivier ROUSSEL
This is runsolver version 3.3.1 (svn: 989)
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
command line: BIN/runsolver --timestamp -w /tmp/evaluation-result-3732627-1338691133/watcher-3732627-1338691133 -o /tmp/evaluation-result-3732627-1338691133/solver-3732627-1338691133 -C 1800 -W 1900 -M 15500 java -server -Xms1600M -Xmx1600M -jar HOME/sat4jPseudoResolution.jar HOME/instance-3732627-1338691133.opb
running on 4 cores: 1,3,5,7
Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 1800 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 1830 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 1900 seconds
Enforcing VSIZE limit (soft limit, will send SIGTERM then SIGKILL): 15872000 KiB
Enforcing VSIZE limit (hard limit, stack expansion will fail with SIGSEGV, brk() and mmap() will return ENOMEM): 15923200 KiB
Current StackSize limit: 10240 KiB
[startup+0 s]
/proc/loadavg: 2.00 2.00 2.00 3/196 9966
/proc/meminfo: memFree=27518548/32873844 swapFree=7620/7620
[pid=9966] ppid=9964 vsize=89736 CPUtime=0 cores=1,3,5,7
/proc/9966/stat : 9966 (java) S 9964 9966 6422 0 -1 4202496 1149 0 0 0 0 0 0 0 20 0 2 0 335238102 91889664 870 33554432000 1073741824 1073778376 140735140594608 140735140585744 215127982141 0 0 4096 0 18446744073709551615 0 0 17 1 0 0 0 0 0
/proc/9966/statm: 22434 879 665 9 0 16769 0
[pid=9966/tid=9967] ppid=9964 vsize=89740 CPUtime=0 cores=1,3,5,7
/proc/9966/task/9967/stat : 9967 (java) R 9964 9966 6422 0 -1 4202560 19 0 0 0 0 0 0 0 20 0 2 0 335238103 91893760 886 33554432000 1073741824 1073778376 140735140594608 140735140583672 215124624768 0 0 4096 0 0 0 0 -1 3 0 0 0 0 0
[startup+0.0447179 s]
/proc/loadavg: 2.00 2.00 2.00 3/196 9966
/proc/meminfo: memFree=27518548/32873844 swapFree=7620/7620
[pid=9966] ppid=9964 vsize=2623916 CPUtime=0.03 cores=1,3,5,7
/proc/9966/stat : 9966 (java) S 9964 9966 6422 0 -1 4202496 3938 0 1 0 3 0 0 0 20 0 13 0 335238102 2686889984 5147 33554432000 1073741824 1073778376 140735140594608 140735140585744 215127982141 0 0 0 16784584 18446744073709551615 0 0 17 1 0 0 0 0 0
/proc/9966/statm: 655979 5148 1703 9 0 646680 0
[pid=9966/tid=9967] ppid=9964 vsize=2623916 CPUtime=0.02 cores=1,3,5,7
/proc/9966/task/9967/stat : 9967 (java) R 9964 9966 6422 0 -1 4202560 2758 0 1 0 2 0 0 0 20 0 13 0 335238103 2686889984 5148 33554432000 1073741824 1073778376 140735140594608 139933005250800 215128007949 0 4 0 16784584 0 0 0 -1 3 0 0 0 0 0
Current children cumulated CPU time (s) 0.03
Current children cumulated vsize (KiB) 2623916
[startup+0.100309 s]
/proc/loadavg: 2.00 2.00 2.00 3/196 9966
/proc/meminfo: memFree=27518548/32873844 swapFree=7620/7620
[pid=9966] ppid=9964 vsize=2957856 CPUtime=0.1 cores=1,3,5,7
/proc/9966/stat : 9966 (java) S 9964 9966 6422 0 -1 4202496 4916 0 1 0 9 1 0 0 20 0 18 0 335238102 3028844544 6622 33554432000 1073741824 1073778376 140735140594608 140735140585744 215127982141 0 0 0 16800975 18446744073709551615 0 0 17 1 0 0 0 0 0
/proc/9966/statm: 739464 6622 2127 9 0 729885 0
[pid=9966/tid=9967] ppid=9964 vsize=2957856 CPUtime=0.07 cores=1,3,5,7
/proc/9966/task/9967/stat : 9967 (java) R 9964 9966 6422 0 -1 4202560 3010 0 1 0 6 1 0 0 20 0 18 0 335238103 3028844544 6622 33554432000 1073741824 1073778376 140735140594608 139933005254992 215128007949 0 4 0 16800975 0 0 0 -1 3 0 0 0 0 0
Current children cumulated CPU time (s) 0.1
Current children cumulated vsize (KiB) 2957856
Solver just ended. Dumping a history of the last processes samples
[startup+0.200294 s]
/proc/loadavg: 2.00 2.00 2.00 3/196 9966
/proc/meminfo: memFree=27518548/32873844 swapFree=7620/7620
[pid=9966] ppid=9964 vsize=3024420 CPUtime=0.25 cores=1,3,5,7
/proc/9966/stat : 9966 (java) S 9964 9966 6422 0 -1 4202496 5176 0 1 0 24 1 0 0 20 0 19 0 335238102 3097006080 7361 33554432000 1073741824 1073778376 140735140594608 140735140585744 215127982141 0 0 0 16800975 18446744073709551615 0 0 17 1 0 0 0 0 0
/proc/9966/statm: 756105 7361 2206 9 0 746526 0
[pid=9966/tid=9967] ppid=9964 vsize=3024420 CPUtime=0.17 cores=1,3,5,7
/proc/9966/task/9967/stat : 9967 (java) R 9964 9966 6422 0 -1 4202560 3038 0 1 0 16 1 0 0 20 0 19 0 335238103 3097006080 7361 33554432000 1073741824 1073778376 140735140594608 139933005255376 139932869965935 0 4 0 16800975 0 0 0 -1 3 0 0 0 0 0
Current children cumulated CPU time (s) 0.25
Current children cumulated vsize (KiB) 3024420
Child status: 30
Real time (s): 0.241698
CPU time (s): 0.332948
CPU user time (s): 0.292955
CPU system time (s): 0.039993
CPU usage (%): 137.754
Max. virtual memory (cumulated for all children) (KiB): 3024420
getrusage(RUSAGE_CHILDREN,...) data:
user time used= 0.292955
system time used= 0.039993
maximum resident set size= 37104
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 6705
page faults= 1
swaps= 0
block input operations= 0
block output operations= 64
messages sent= 0
messages received= 0
signals received= 0
voluntary context switches= 200
involuntary context switches= 13
runsolver used 0 second user time and 0.006998 second system time
The end
Begin job on node135 at 2012-06-03 04:38:53
IDJOB=3732627
IDBENCH=2147
IDSOLVER=2319
FILE ID=node135/3732627-1338691133
RUNJOBID= node135-1338678628-6442
PBS_JOBID= 14636678
Free space on /tmp= 70976 MiB
SOLVER NAME= PB07: SAT4JPseudoResolution 2007-03-23
BENCH NAME= PB06//final/normalized-PB06/OPT-SMALLINT/submitted-PB05/manquinho/primes-dimacs-cnf/normalized-aim-200-2_0-yes1-3.opb
COMMAND LINE= java -server -Xms1600M -Xmx1600M -jar HOME/sat4jPseudoResolution.jar BENCHNAME
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-3732627-1338691133/watcher-3732627-1338691133 -o /tmp/evaluation-result-3732627-1338691133/solver-3732627-1338691133 -C 1800 -W 1900 -M 15500 java -server -Xms1600M -Xmx1600M -jar HOME/sat4jPseudoResolution.jar HOME/instance-3732627-1338691133.opb
TIME LIMIT= 1800 seconds
MEMORY LIMIT= 15500 MiB
NBCORE= 4
MD5SUM BENCH= a7b7899aac4e8bbad83795fe620e3d59
RANDOM SEED=906672712
node135.alineos.net Linux 2.6.32-71.29.1.el6.x86_64 #1 SMP Mon Jun 27 19:49:27 BST 2011
/proc/cpuinfo:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
stepping : 5
cpu MHz : 2666.820
cache size : 8192 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips : 5333.64
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
stepping : 5
cpu MHz : 2666.820
cache size : 8192 KB
physical id : 1
siblings : 4
core id : 0
cpu cores : 4
apicid : 16
initial apicid : 16
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips : 5332.57
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
stepping : 5
cpu MHz : 2666.820
cache size : 8192 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 4
apicid : 2
initial apicid : 2
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips : 5332.55
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
stepping : 5
cpu MHz : 2666.820
cache size : 8192 KB
physical id : 1
siblings : 4
core id : 1
cpu cores : 4
apicid : 18
initial apicid : 18
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips : 5332.55
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
processor : 4
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
stepping : 5
cpu MHz : 2666.820
cache size : 8192 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 4
apicid : 4
initial apicid : 4
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips : 5332.54
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
processor : 5
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
stepping : 5
cpu MHz : 2666.820
cache size : 8192 KB
physical id : 1
siblings : 4
core id : 2
cpu cores : 4
apicid : 20
initial apicid : 20
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips : 5332.55
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
processor : 6
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
stepping : 5
cpu MHz : 2666.820
cache size : 8192 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
apicid : 6
initial apicid : 6
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips : 5238.35
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
processor : 7
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Intel(R) Xeon(R) CPU X5550 @ 2.67GHz
stepping : 5
cpu MHz : 2666.820
cache size : 8192 KB
physical id : 1
siblings : 4
core id : 3
cpu cores : 4
apicid : 22
initial apicid : 22
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips : 5332.55
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
/proc/meminfo:
MemTotal: 32873844 kB
MemFree: 27519076 kB
Buffers: 354016 kB
Cached: 2480064 kB
SwapCached: 1672 kB
Active: 2794352 kB
Inactive: 1698664 kB
Active(anon): 1649496 kB
Inactive(anon): 12036 kB
Active(file): 1144856 kB
Inactive(file): 1686628 kB
Unevictable: 7620 kB
Mlocked: 7620 kB
SwapTotal: 67108856 kB
SwapFree: 67105800 kB
Dirty: 3480 kB
Writeback: 0 kB
AnonPages: 1694112 kB
Mapped: 18788 kB
Shmem: 132 kB
Slab: 702164 kB
SReclaimable: 143028 kB
SUnreclaim: 559136 kB
KernelStack: 1768 kB
PageTables: 7344 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 83545776 kB
Committed_AS: 1825344 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 346376 kB
VmallocChunk: 34341987860 kB
HardwareCorrupted: 0 kB
AnonHugePages: 1658880 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 7872 kB
DirectMap2M: 33538048 kB
Free space on /tmp at the end= 70972 MiB
End job on node135 at 2012-06-03 04:38:54