Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:44 2012

Optimize a model with 436 rows, 132 columns and 872 nonzeros
Presolve removed 85 rows and 5 columns
Presolve time: 0.00s
Presolved: 351 rows, 127 columns, 734 nonzeros
Variable types: 0 continuous, 127 integer (127 binary)
Found heuristic solution: objective 46.0000000

Root relaxation: objective 5.750000e+01, 170 iterations, 0.00 seconds

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

     0     0   57.50000    0   97   46.00000   57.50000  25.0%     -    0s
     0     0   56.00000    0  121   46.00000   56.00000  21.7%     -    0s
H    0     0                      49.0000000   56.00000  14.3%     -    0s
     0     0   55.47458    0  124   49.00000   55.47458  13.2%     -    0s
     0     0   54.91339    0  125   49.00000   54.91339  12.1%     -    0s
H    0     0                      50.0000000   54.91339  9.83%     -    0s
     0     0   54.45455    0  125   50.00000   54.45455  8.91%     -    0s
     0     0   54.29128    0  126   50.00000   54.29128  8.58%     -    0s
     0     0   54.14286    0  120   50.00000   54.14286  8.29%     -    0s
     0     0   54.08421    0  126   50.00000   54.08421  8.17%     -    0s
     0     0   54.05036    0  126   50.00000   54.05036  8.10%     -    0s
     0     0   54.05036    0  126   50.00000   54.05036  8.10%     -    0s
     0     2   54.04000    0  126   50.00000   54.04000  8.08%     -    0s
*    6     6               4      52.0000000   53.73520  3.34%  46.8    0s

Cutting planes:
  Gomory: 1
  Zero half: 58

Explored 21 nodes (1394 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%