Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:53 2012

Optimize a model with 445 rows, 134 columns and 890 nonzeros
Presolve removed 73 rows and 0 columns
Presolve time: 0.00s
Presolved: 372 rows, 134 columns, 789 nonzeros
Variable types: 0 continuous, 134 integer (134 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 5.700000e+01, 180 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  110   45.00000   57.00000  26.7%     -    0s
     0     0   55.87500    0  131   45.00000   55.87500  24.2%     -    0s
H    0     0                      49.0000000   55.87500  14.0%     -    0s
     0     0   54.73292    0  129   49.00000   54.73292  11.7%     -    0s
H    0     0                      50.0000000   54.73292  9.47%     -    0s
     0     0   54.10959    0  133   50.00000   54.10959  8.22%     -    0s
     0     0   53.87500    0  131   50.00000   53.87500  7.75%     -    0s
     0     0   53.44113    0  132   50.00000   53.44113  6.88%     -    0s
     0     0   53.41722    0  133   50.00000   53.41722  6.83%     -    0s
     0     0   53.41722    0  130   50.00000   53.41722  6.83%     -    0s
     0     2   53.41577    0  130   50.00000   53.41577  6.83%     -    0s

Cutting planes:
  Gomory: 1
  Zero half: 81

Explored 82 nodes (3858 simplex iterations) in 0.15 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%