Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:53 2012

Optimize a model with 521 rows, 142 columns and 1042 nonzeros
Presolve removed 133 rows and 2 columns
Presolve time: 0.00s
Presolved: 388 rows, 140 columns, 859 nonzeros
Variable types: 0 continuous, 140 integer (140 binary)
Found heuristic solution: objective 46.0000000

Root relaxation: objective 5.846429e+01, 282 iterations, 0.00 seconds

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

     0     0   58.46429    0  133   46.00000   58.46429  27.1%     -    0s
H    0     0                      49.0000000   58.46429  19.3%     -    0s
     0     0   56.93750    0  131   49.00000   56.93750  16.2%     -    0s
     0     0   56.28571    0  132   49.00000   56.28571  14.9%     -    0s
H    0     0                      50.0000000   56.28571  12.6%     -    0s
     0     0   56.20000    0  126   50.00000   56.20000  12.4%     -    0s
H    0     0                      51.0000000   56.20000  10.2%     -    0s
     0     0   56.11111    0  132   51.00000   56.11111  10.0%     -    0s
     0     0   55.90698    0  135   51.00000   55.90698  9.62%     -    0s
     0     0   55.77692    0  139   51.00000   55.77692  9.37%     -    0s
     0     0   55.39992    0  137   51.00000   55.39992  8.63%     -    0s
     0     0   55.37855    0  137   51.00000   55.37855  8.59%     -    0s
     0     0   55.37855    0  135   51.00000   55.37855  8.59%     -    0s
     0     2   55.37712    0  134   51.00000   55.37712  8.58%     -    0s

Cutting planes:
  Zero half: 110

Explored 339 nodes (11588 simplex iterations) in 0.43 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%