Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:35:14 2012

Optimize a model with 531 rows, 149 columns and 1062 nonzeros
Presolve removed 120 rows and 7 columns
Presolve time: 0.00s
Presolved: 411 rows, 142 columns, 879 nonzeros
Variable types: 0 continuous, 142 integer (142 binary)
Found heuristic solution: objective 52.0000000

Root relaxation: objective 6.300000e+01, 228 iterations, 0.00 seconds

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

     0     0   63.00000    0  106   52.00000   63.00000  21.2%     -    0s
H    0     0                      55.0000000   63.00000  14.5%     -    0s
     0     0   61.75000    0  122   55.00000   61.75000  12.3%     -    0s
     0     0   61.00000    0  133   55.00000   61.00000  10.9%     -    0s
     0     0   60.32258    0  134   55.00000   60.32258  9.68%     -    0s
     0     0   60.05882    0  132   55.00000   60.05882  9.20%     -    0s
     0     0   59.88439    0  141   55.00000   59.88439  8.88%     -    0s
     0     0   59.74312    0  140   55.00000   59.74312  8.62%     -    0s
     0     0   59.53007    0  137   55.00000   59.53007  8.24%     -    0s
     0     0   59.47085    0  139   55.00000   59.47085  8.13%     -    0s
     0     0   59.44588    0  139   55.00000   59.44588  8.08%     -    0s
     0     0   59.44588    0  138   55.00000   59.44588  8.08%     -    0s
H    0     0                      57.0000000   59.44588  4.29%     -    0s
     0     2   59.44351    0  138   57.00000   59.44351  4.29%     -    0s

Cutting planes:
  Gomory: 2
  Zero half: 96

Explored 26 nodes (2114 simplex iterations) in 0.13 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.700000000000e+01, best bound 5.700000000000e+01, gap 0.0%