Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:36:50 2012

Optimize a model with 567 rows, 151 columns and 1134 nonzeros
Presolve removed 106 rows and 2 columns
Presolve time: 0.00s
Presolved: 461 rows, 149 columns, 986 nonzeros
Variable types: 0 continuous, 149 integer (149 binary)
Found heuristic solution: objective 52.0000000

Root relaxation: objective 6.300000e+01, 235 iterations, 0.00 seconds

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

     0     0   63.00000    0  114   52.00000   63.00000  21.2%     -    0s
H    0     0                      54.0000000   63.00000  16.7%     -    0s
     0     0   62.12500    0  141   54.00000   62.12500  15.0%     -    0s
     0     0   61.33000    0  146   54.00000   61.33000  13.6%     -    0s
     0     0   60.62963    0  139   54.00000   60.62963  12.3%     -    0s
     0     0   60.22836    0  147   54.00000   60.22836  11.5%     -    0s
H    0     0                      55.0000000   60.22836  9.51%     -    0s
     0     0   60.08621    0  146   55.00000   60.08621  9.25%     -    0s
     0     0   59.92215    0  147   55.00000   59.92215  8.95%     -    0s
     0     0   59.71942    0  147   55.00000   59.71942  8.58%     -    0s
     0     0   59.63174    0  147   55.00000   59.63174  8.42%     -    0s
     0     0   59.51867    0  148   55.00000   59.51867  8.22%     -    0s
     0     0   59.44121    0  147   55.00000   59.44121  8.07%     -    0s
     0     0   59.41764    0  149   55.00000   59.41764  8.03%     -    0s
     0     0   59.41764    0  149   55.00000   59.41764  8.03%     -    0s
     0     2   59.41232    0  148   55.00000   59.41232  8.02%     -    0s

Cutting planes:
  Zero half: 113

Explored 142 nodes (7813 simplex iterations) in 0.37 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%