Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:55 2012

Optimize a model with 521 rows, 143 columns and 1042 nonzeros
Presolve removed 106 rows and 5 columns
Presolve time: 0.00s
Presolved: 415 rows, 138 columns, 877 nonzeros
Variable types: 0 continuous, 138 integer (138 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 6.100000e+01, 212 iterations, 0.00 seconds

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

     0     0   61.00000    0  112   51.00000   61.00000  19.6%     -    0s
     0     0   59.43750    0  132   51.00000   59.43750  16.5%     -    0s
     0     0   58.37500    0  133   51.00000   58.37500  14.5%     -    0s
     0     0   57.66667    0  124   51.00000   57.66667  13.1%     -    0s
     0     0   57.52041    0  134   51.00000   57.52041  12.8%     -    0s
H    0     0                      52.0000000   57.52041  10.6%     -    0s
     0     0   57.22112    0  134   52.00000   57.22112  10.0%     -    0s
     0     0   57.06619    0  136   52.00000   57.06619  9.74%     -    0s
     0     0   56.94703    0  136   52.00000   56.94703  9.51%     -    0s
     0     0   56.77235    0  136   52.00000   56.77235  9.18%     -    0s
H    0     0                      53.0000000   56.77235  7.12%     -    0s
     0     0   56.61670    0  136   53.00000   56.61670  6.82%     -    0s
     0     0   56.52231    0  137   53.00000   56.52231  6.65%     -    0s
     0     0   56.50750    0  137   53.00000   56.50750  6.62%     -    0s
     0     0   56.50750    0  137   53.00000   56.50750  6.62%     -    0s
     0     2   56.50721    0  137   53.00000   56.50721  6.62%     -    0s

Cutting planes:
  Zero half: 94

Explored 58 nodes (3423 simplex iterations) in 0.18 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%