Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:39 2012

Optimize a model with 424 rows, 130 columns and 848 nonzeros
Presolve removed 89 rows and 2 columns
Presolve time: 0.00s
Presolved: 335 rows, 128 columns, 718 nonzeros
Variable types: 0 continuous, 128 integer (128 binary)
Found heuristic solution: objective 45.0000000

Root relaxation: objective 5.580000e+01, 240 iterations, 0.00 seconds

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

     0     0   55.80000    0  118   45.00000   55.80000  24.0%     -    0s
H    0     0                      49.0000000   55.80000  13.9%     -    0s
H    0     0                      50.0000000   55.80000  11.6%     -    0s
     0     0   55.00000    0  120   50.00000   55.00000  10.0%     -    0s
     0     0   54.86118    0  125   50.00000   54.86118  9.72%     -    0s
H    0     0                      51.0000000   54.86118  7.57%     -    0s
     0     0   54.59459    0  126   51.00000   54.59459  7.05%     -    0s
     0     0   54.15920    0  127   51.00000   54.15920  6.19%     -    0s
     0     0   53.93827    0  124   51.00000   53.93827  5.76%     -    0s
     0     0   53.77150    0  127   51.00000   53.77150  5.43%     -    0s
     0     0   53.56790    0  126   51.00000   53.56790  5.04%     -    0s
     0     0   53.49340    0  125   51.00000   53.49340  4.89%     -    0s
     0     0   53.47639    0  126   51.00000   53.47639  4.86%     -    0s
     0     0   53.47639    0  126   51.00000   53.47639  4.86%     -    0s
H    0     0                      52.0000000   53.47639  2.84%     -    0s
     0     2   53.47639    0  126   52.00000   53.47639  2.84%     -    0s

Cutting planes:
  Zero half: 40

Explored 13 nodes (1118 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%