Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:42 2012

Optimize a model with 429 rows, 131 columns and 858 nonzeros
Presolve removed 80 rows and 2 columns
Presolve time: 0.00s
Presolved: 349 rows, 129 columns, 740 nonzeros
Variable types: 0 continuous, 129 integer (129 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 5.700000e+01, 228 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  104   47.00000   57.00000  21.3%     -    0s
     0     0   55.50000    0  118   47.00000   55.50000  18.1%     -    0s
     0     0   55.33333    0  118   47.00000   55.33333  17.7%     -    0s
H    0     0                      50.0000000   55.33333  10.7%     -    0s
     0     0   54.79167    0  123   50.00000   54.79167  9.58%     -    0s
     0     0   54.18667    0  126   50.00000   54.18667  8.37%     -    0s
     0     0   53.63502    0  128   50.00000   53.63502  7.27%     -    0s
     0     0   53.25472    0  127   50.00000   53.25472  6.51%     -    0s
     0     0   53.19797    0  127   50.00000   53.19797  6.40%     -    0s
     0     0   52.87565    0  125   50.00000   52.87565  5.75%     -    0s
     0     0   52.82979    0  127   50.00000   52.82979  5.66%     -    0s
     0     0   52.79051    0  128   50.00000   52.79051  5.58%     -    0s
     0     0   52.79051    0  125   50.00000   52.79051  5.58%     -    0s
     0     2   52.75610    0  125   50.00000   52.75610  5.51%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 82

Explored 51 nodes (2561 simplex iterations) in 0.13 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%