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

Optimize a model with 462 rows, 132 columns and 924 nonzeros
Presolve removed 117 rows and 6 columns
Presolve time: 0.00s
Presolved: 345 rows, 126 columns, 739 nonzeros
Variable types: 0 continuous, 126 integer (126 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 5.675000e+01, 205 iterations, 0.00 seconds

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

     0     0   56.75000    0  123   47.00000   56.75000  20.7%     -    0s
H    0     0                      49.0000000   56.75000  15.8%     -    0s
     0     0   55.82353    0  121   49.00000   55.82353  13.9%     -    0s
     0     0   55.25532    0  124   49.00000   55.25532  12.8%     -    0s
     0     0   54.73858    0  125   49.00000   54.73858  11.7%     -    0s
H    0     0                      50.0000000   54.73858  9.48%     -    0s
H    0     0                      51.0000000   54.73858  7.33%     -    0s
     0     0   54.36355    0  123   51.00000   54.36355  6.60%     -    0s
     0     0   54.22567    0  123   51.00000   54.22567  6.32%     -    0s
     0     0   53.60411    0  122   51.00000   53.60411  5.11%     -    0s
     0     0   53.49569    0  121   51.00000   53.49569  4.89%     -    0s
     0     0   53.45740    0  122   51.00000   53.45740  4.82%     -    0s
     0     0   53.41594    0  122   51.00000   53.41594  4.74%     -    0s
     0     0   53.38330    0  123   51.00000   53.38330  4.67%     -    0s
     0     0   53.38330    0  121   51.00000   53.38330  4.67%     -    0s
     0     2   53.37984    0  120   51.00000   53.37984  4.67%     -    0s

Cutting planes:
  Zero half: 57

Explored 27 nodes (1550 simplex iterations) in 0.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%