Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:18 2012

Optimize a model with 321 rows, 114 columns and 642 nonzeros
Presolve removed 25 rows and 1 columns
Presolve time: 0.00s
Presolved: 296 rows, 113 columns, 605 nonzeros
Variable types: 0 continuous, 113 integer (113 binary)
Found heuristic solution: objective 41.0000000

Root relaxation: objective 5.250000e+01, 160 iterations, 0.00 seconds

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

     0     0   52.50000    0   95   41.00000   52.50000  28.0%     -    0s
H    0     0                      42.0000000   52.50000  25.0%     -    0s
     0     0   51.25000    0  101   42.00000   51.25000  22.0%     -    0s
H    0     0                      47.0000000   51.25000  9.04%     -    0s
     0     0   50.86458    0  113   47.00000   50.86458  8.22%     -    0s
     0     0   50.10714    0  111   47.00000   50.10714  6.61%     -    0s
     0     0   49.33333    0  107   47.00000   49.33333  4.96%     -    0s
     0     0   49.24638    0  112   47.00000   49.24638  4.78%     -    0s
     0     0   49.08333    0  113   47.00000   49.08333  4.43%     -    0s
     0     0   48.84733    0  113   47.00000   48.84733  3.93%     -    0s
     0     0   48.75000    0  105   47.00000   48.75000  3.72%     -    0s
     0     0   48.73333    0  113   47.00000   48.73333  3.69%     -    0s
     0     0   48.73333    0  113   47.00000   48.73333  3.69%     -    0s
     0     2   48.73333    0  113   47.00000   48.73333  3.69%     -    0s

Cutting planes:
  Zero half: 77

Explored 31 nodes (1377 simplex iterations) in 0.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%