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

Optimize a model with 431 rows, 131 columns and 862 nonzeros
Presolve removed 120 rows and 6 columns
Presolve time: 0.00s
Presolved: 311 rows, 125 columns, 667 nonzeros
Variable types: 0 continuous, 125 integer (125 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 5.475000e+01, 199 iterations, 0.00 seconds

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

     0     0   54.75000    0  107   47.00000   54.75000  16.5%     -    0s
     0     0   53.00000    0  101   47.00000   53.00000  12.8%     -    0s
     0     0   52.73333    0  116   47.00000   52.73333  12.2%     -    0s
H    0     0                      48.0000000   52.73333  9.86%     -    0s
     0     0   52.48077    0  119   48.00000   52.48077  9.33%     -    0s
H    0     0                      49.0000000   52.48077  7.10%     -    0s
     0     0   52.33766    0  123   49.00000   52.33766  6.81%     -    0s
     0     0   52.17677    0  122   49.00000   52.17677  6.48%     -    0s
     0     0   52.11765    0  122   49.00000   52.11765  6.36%     -    0s
     0     0   52.11290    0  121   49.00000   52.11290  6.35%     -    0s
     0     0   52.11111    0  124   49.00000   52.11111  6.35%     -    0s
     0     0   52.11111    0  117   49.00000   52.11111  6.35%     -    0s
H    0     0                      50.0000000   52.11111  4.22%     -    0s
     0     2   52.11111    0  117   50.00000   52.11111  4.22%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 50

Explored 23 nodes (1246 simplex iterations) in 0.08 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%