Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:38 2012

Optimize a model with 418 rows, 129 columns and 836 nonzeros
Presolve removed 76 rows and 3 columns
Presolve time: 0.00s
Presolved: 342 rows, 126 columns, 721 nonzeros
Variable types: 0 continuous, 126 integer (126 binary)
Found heuristic solution: objective 46.0000000

Root relaxation: objective 5.700000e+01, 172 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   55.50000    0  101   46.00000   55.50000  20.7%     -    0s
     0     0   54.78947    0  122   46.00000   54.78947  19.1%     -    0s
     0     0   54.50000    0  110   46.00000   54.50000  18.5%     -    0s
     0     0   54.29932    0  125   46.00000   54.29932  18.0%     -    0s
H    0     0                      48.0000000   54.29932  13.1%     -    0s
     0     0   53.98485    0  125   48.00000   53.98485  12.5%     -    0s
H    0     0                      49.0000000   53.98485  10.2%     -    0s
     0     0   53.63089    0  124   49.00000   53.63089  9.45%     -    0s
     0     0   53.61120    0  124   49.00000   53.61120  9.41%     -    0s
     0     0   53.61120    0  122   49.00000   53.61120  9.41%     -    0s
H    0     0                      50.0000000   53.61120  7.22%     -    0s
     0     2   53.59918    0  122   50.00000   53.59918  7.20%     -    0s
H    9     3                      51.0000000   53.59918  5.10%  23.8    0s

Cutting planes:
  Gomory: 1
  Zero half: 56

Explored 32 nodes (1561 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%