Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:42:38 2012

Optimize a model with 631 rows, 160 columns and 1262 nonzeros
Presolve removed 146 rows and 4 columns
Presolve time: 0.00s
Presolved: 485 rows, 156 columns, 1046 nonzeros
Variable types: 0 continuous, 156 integer (156 binary)
Found heuristic solution: objective 55.0000000

Root relaxation: objective 6.500000e+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   65.00000    0  138   55.00000   65.00000  18.2%     -    0s
     0     0   64.69486    0  153   55.00000   64.69486  17.6%     -    0s
     0     0   63.86755    0  148   55.00000   63.86755  16.1%     -    0s
H    0     0                      57.0000000   63.86755  12.0%     -    0s
     0     0   63.41280    0  149   57.00000   63.41280  11.3%     -    0s
     0     0   63.04970    0  151   57.00000   63.04970  10.6%     -    0s
     0     0   62.71294    0  149   57.00000   62.71294  10.0%     -    0s
     0     0   62.57586    0  151   57.00000   62.57586  9.78%     -    0s
     0     0   62.48365    0  151   57.00000   62.48365  9.62%     -    0s
     0     0   62.46906    0  154   57.00000   62.46906  9.59%     -    0s
     0     0   62.46906    0  153   57.00000   62.46906  9.59%     -    0s
     0     2   62.46785    0  153   57.00000   62.46785  9.59%     -    0s
H   22     5                      59.0000000   62.37403  5.72%  46.1    0s

Cutting planes:
  Zero half: 106

Explored 76 nodes (4600 simplex iterations) in 0.26 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.900000000000e+01, best bound 5.900000000000e+01, gap 0.0%