Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:05 2012

Optimize a model with 501 rows, 136 columns and 1002 nonzeros
Presolve removed 107 rows and 2 columns
Presolve time: 0.00s
Presolved: 394 rows, 134 columns, 854 nonzeros
Variable types: 0 continuous, 134 integer (134 binary)
Found heuristic solution: objective 46.0000000

Root relaxation: objective 5.700000e+01, 233 iterations, 0.00 seconds

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

     0     0   57.00000    0  102   46.00000   57.00000  23.9%     -    0s
     0     0   56.56250    0  125   46.00000   56.56250  23.0%     -    0s
     0     0   56.00000    0  121   46.00000   56.00000  21.7%     -    0s
H    0     0                      48.0000000   56.00000  16.7%     -    0s
     0     0   55.46999    0  134   48.00000   55.46999  15.6%     -    0s
     0     0   54.87952    0  133   48.00000   54.87952  14.3%     -    0s
     0     0   54.65803    0  133   48.00000   54.65803  13.9%     -    0s
     0     0   54.58160    0  133   48.00000   54.58160  13.7%     -    0s
     0     0   54.48364    0  134   48.00000   54.48364  13.5%     -    0s
     0     0   54.44401    0  134   48.00000   54.44401  13.4%     -    0s
     0     0   54.42134    0  134   48.00000   54.42134  13.4%     -    0s
     0     0   54.42134    0  134   48.00000   54.42134  13.4%     -    0s
     0     2   54.41937    0  134   48.00000   54.41937  13.4%     -    0s
*   17    13              12      49.0000000   54.41937  11.1%  36.8    0s
*   61    22               6      50.0000000   53.76941  7.54%  35.0    0s

Cutting planes:
  Zero half: 130

Explored 200 nodes (7590 simplex iterations) in 0.32 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%