Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:33 2012

Optimize a model with 401 rows, 127 columns and 802 nonzeros
Presolve removed 77 rows and 6 columns
Presolve time: 0.00s
Presolved: 324 rows, 121 columns, 685 nonzeros
Variable types: 0 continuous, 121 integer (121 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 5.433333e+01, 185 iterations, 0.00 seconds

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

     0     0   54.33333    0  110   45.00000   54.33333  20.7%     -    0s
     0     0   53.30000    0  115   45.00000   53.30000  18.4%     -    0s
     0     0   52.85714    0  119   45.00000   52.85714  17.5%     -    0s
     0     0   52.57143    0  118   45.00000   52.57143  16.8%     -    0s
H    0     0                      47.0000000   52.57143  11.9%     -    0s
     0     0   52.32780    0  121   47.00000   52.32780  11.3%     -    0s
H    0     0                      48.0000000   52.32780  9.02%     -    0s
     0     0   52.11336    0  120   48.00000   52.11336  8.57%     -    0s
     0     0   52.03333    0  119   48.00000   52.03333  8.40%     -    0s
     0     0   51.84109    0  121   48.00000   51.84109  8.00%     -    0s
     0     0   51.68919    0  118   48.00000   51.68919  7.69%     -    0s
     0     0   51.63240    0  118   48.00000   51.63240  7.57%     -    0s
     0     0   51.60356    0  120   48.00000   51.60356  7.51%     -    0s
     0     0   51.60356    0  119   48.00000   51.60356  7.51%     -    0s
     0     2   51.60066    0  118   48.00000   51.60066  7.50%     -    0s

Cutting planes:
  Zero half: 92

Explored 111 nodes (3477 simplex iterations) in 0.15 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.800000000000e+01, best bound 4.800000000000e+01, gap 0.0%