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

Optimize a model with 452 rows, 138 columns and 904 nonzeros
Presolve removed 97 rows and 7 columns
Presolve time: 0.00s
Presolved: 355 rows, 131 columns, 756 nonzeros
Variable types: 0 continuous, 131 integer (131 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 5.990000e+01, 248 iterations, 0.00 seconds

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

     0     0   59.90000    0  118   51.00000   59.90000  17.5%     -    0s
     0     0   58.96078    0  127   51.00000   58.96078  15.6%     -    0s
     0     0   58.12765    0  129   51.00000   58.12765  14.0%     -    0s
     0     0   57.57586    0  130   51.00000   57.57586  12.9%     -    0s
     0     0   57.28510    0  130   51.00000   57.28510  12.3%     -    0s
     0     0   57.09411    0  130   51.00000   57.09411  11.9%     -    0s
     0     0   57.02279    0  131   51.00000   57.02279  11.8%     -    0s
     0     0   57.01100    0  131   51.00000   57.01100  11.8%     -    0s
     0     0   57.01100    0  130   51.00000   57.01100  11.8%     -    0s
     0     2   57.00440    0  130   51.00000   57.00440  11.8%     -    0s
*   15     8               9      52.0000000   57.00440  9.62%  23.5    0s
H   65    17                      53.0000000   55.87179  5.42%  31.0    0s

Cutting planes:
  Zero half: 94

Explored 166 nodes (5170 simplex iterations) in 0.21 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%