Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:43 2012

Optimize a model with 431 rows, 132 columns and 862 nonzeros
Presolve removed 95 rows and 4 columns
Presolve time: 0.00s
Presolved: 336 rows, 128 columns, 725 nonzeros
Variable types: 0 continuous, 128 integer (128 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 5.600000e+01, 224 iterations, 0.00 seconds

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

     0     0   56.00000    0   92   45.00000   56.00000  24.4%     -    0s
     0     0   55.31034    0  124   45.00000   55.31034  22.9%     -    0s
H    0     0                      51.0000000   55.31034  8.45%     -    0s
     0     0   54.50000    0  127   51.00000   54.50000  6.86%     -    0s
     0     0   54.28065    0  126   51.00000   54.28065  6.43%     -    0s
     0     0   53.92633    0  126   51.00000   53.92633  5.74%     -    0s
     0     0   53.69144    0  124   51.00000   53.69144  5.28%     -    0s
     0     0   53.46604    0  124   51.00000   53.46604  4.84%     -    0s
     0     0   53.28163    0  121   51.00000   53.28163  4.47%     -    0s
     0     0   53.14645    0  128   51.00000   53.14645  4.21%     -    0s
     0     0   53.01220    0  128   51.00000   53.01220  3.95%     -    0s
     0     0   52.98968    0  128   51.00000   52.98968  3.90%     -    0s
     0     0   52.98968    0  126   51.00000   52.98968  3.90%     -    0s
     0     2   52.98968    0  126   51.00000   52.98968  3.90%     -    0s

Cutting planes:
  Zero half: 61

Explored 17 nodes (1627 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%