Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:46:57 2012

Optimize a model with 658 rows, 163 columns and 1316 nonzeros
Presolve removed 163 rows and 2 columns
Presolve time: 0.00s
Presolved: 495 rows, 161 columns, 1096 nonzeros
Variable types: 0 continuous, 161 integer (161 binary)
Found heuristic solution: objective 52.0000000

Root relaxation: objective 6.625000e+01, 295 iterations, 0.01 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0   66.25000    0  140   52.00000   66.25000  27.4%     -    0s
     0     0   65.00000    0  146   52.00000   65.00000  25.0%     -    0s
H    0     0                      53.0000000   65.00000  22.6%     -    0s
     0     0   64.46180    0  160   53.00000   64.46180  21.6%     -    0s
H    0     0                      54.0000000   64.46180  19.4%     -    0s
     0     0   63.91169    0  158   54.00000   63.91169  18.4%     -    0s
     0     0   63.57929    0  160   54.00000   63.57929  17.7%     -    0s
     0     0   63.33454    0  160   54.00000   63.33454  17.3%     -    0s
     0     0   63.22705    0  160   54.00000   63.22705  17.1%     -    0s
     0     0   62.91895    0  161   54.00000   62.91895  16.5%     -    0s
     0     0   62.71421    0  161   54.00000   62.71421  16.1%     -    0s
     0     0   62.64425    0  159   54.00000   62.64425  16.0%     -    0s
     0     0   62.41455    0  160   54.00000   62.41455  15.6%     -    0s
     0     0   62.31160    0  160   54.00000   62.31160  15.4%     -    0s
     0     0   62.24770    0  161   54.00000   62.24770  15.3%     -    0s
     0     0   62.03635    0  161   54.00000   62.03635  14.9%     -    0s
     0     0   61.98959    0  161   54.00000   61.98959  14.8%     -    0s
     0     0   61.94978    0  156   54.00000   61.94978  14.7%     -    0s
     0     0   61.88287    0  158   54.00000   61.88287  14.6%     -    0s
     0     0   61.77086    0  159   54.00000   61.77086  14.4%     -    0s
     0     0   61.67485    0  159   54.00000   61.67485  14.2%     -    0s
     0     0   61.65109    0  161   54.00000   61.65109  14.2%     -    0s
     0     0   61.65109    0  161   54.00000   61.65109  14.2%     -    0s
H    0     0                      55.0000000   61.65109  12.1%     -    0s
     0     2   61.65072    0  161   55.00000   61.65072  12.1%     -    0s
*   81    35              12      56.0000000   60.50000  8.04%  55.8    0s
   617   102   58.85749    9  161   56.00000   59.01475  5.38%  43.6    5s

Cutting planes:
  Gomory: 4
  Clique: 1
  Zero half: 207

Explored 1572 nodes (70769 simplex iterations) in 9.62 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%