Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:55 2012

Optimize a model with 449 rows, 135 columns and 898 nonzeros
Presolve removed 91 rows and 0 columns
Presolve time: 0.00s
Presolved: 358 rows, 135 columns, 770 nonzeros
Variable types: 0 continuous, 135 integer (135 binary)
Found heuristic solution: objective 48.0000000

Root relaxation: objective 5.737037e+01, 242 iterations, 0.00 seconds

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

     0     0   57.37037    0  130   48.00000   57.37037  19.5%     -    0s
H    0     0                      49.0000000   57.37037  17.1%     -    0s
     0     0   56.52941    0  133   49.00000   56.52941  15.4%     -    0s
H    0     0                      50.0000000   56.52941  13.1%     -    0s
     0     0   55.85714    0  129   50.00000   55.85714  11.7%     -    0s
     0     0   55.37309    0  128   50.00000   55.37309  10.7%     -    0s
     0     0   55.01519    0  128   50.00000   55.01519  10.0%     -    0s
     0     0   54.57121    0  132   50.00000   54.57121  9.14%     -    0s
     0     0   54.48845    0  134   50.00000   54.48845  8.98%     -    0s
     0     0   54.45262    0  134   50.00000   54.45262  8.91%     -    0s
     0     0   54.39062    0  134   50.00000   54.39062  8.78%     -    0s
     0     0   54.38677    0  134   50.00000   54.38677  8.77%     -    0s
     0     0   54.38677    0  133   50.00000   54.38677  8.77%     -    0s
H    0     0                      51.0000000   54.38677  6.64%     -    0s
     0     2   54.38239    0  133   51.00000   54.38239  6.63%     -    0s

Cutting planes:
  Zero half: 77

Explored 117 nodes (3908 simplex iterations) in 0.19 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%