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

Optimize a model with 417 rows, 127 columns and 834 nonzeros
Presolve removed 105 rows and 7 columns
Presolve time: 0.00s
Presolved: 312 rows, 120 columns, 670 nonzeros
Variable types: 0 continuous, 120 integer (120 binary)
Found heuristic solution: objective 46.0000000

Root relaxation: objective 5.430000e+01, 208 iterations, 0.00 seconds

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

     0     0   54.30000    0  114   46.00000   54.30000  18.0%     -    0s
H    0     0                      47.0000000   54.30000  15.5%     -    0s
H    0     0                      48.0000000   54.30000  13.1%     -    0s
     0     0   53.72581    0  114   48.00000   53.72581  11.9%     -    0s
     0     0   52.81429    0  115   48.00000   52.81429  10.0%     -    0s
     0     0   52.30645    0  114   48.00000   52.30645  8.97%     -    0s
H    0     0                      49.0000000   52.30645  6.75%     -    0s
     0     0   52.03370    0  118   49.00000   52.03370  6.19%     -    0s
     0     0   51.61146    0  119   49.00000   51.61146  5.33%     -    0s
     0     0   51.49851    0  114   49.00000   51.49851  5.10%     -    0s
     0     0   51.39875    0  117   49.00000   51.39875  4.90%     -    0s
     0     0   51.28070    0  115   49.00000   51.28070  4.65%     -    0s
     0     0   51.21805    0  115   49.00000   51.21805  4.53%     -    0s
     0     0   51.20047    0  117   49.00000   51.20047  4.49%     -    0s
     0     0   51.20047    0  113   49.00000   51.20047  4.49%     -    0s
     0     2   51.19572    0  112   49.00000   51.19572  4.48%     -    0s

Cutting planes:
  Zero half: 67

Explored 21 nodes (1258 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.900000000000e+01, best bound 4.900000000000e+01, gap 0.0%