Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:43:00 2012

Optimize a model with 640 rows, 160 columns and 1280 nonzeros
Presolve removed 148 rows and 5 columns
Presolve time: 0.00s
Presolved: 492 rows, 155 columns, 1063 nonzeros
Variable types: 0 continuous, 155 integer (155 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 6.750000e+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   67.50000    0  129   51.00000   67.50000  32.4%     -    0s
     0     0   66.36782    0  153   51.00000   66.36782  30.1%     -    0s
     0     0   65.56989    0  152   51.00000   65.56989  28.6%     -    0s
H    0     0                      53.0000000   65.56989  23.7%     -    0s
     0     0   64.41724    0  153   53.00000   64.41724  21.5%     -    0s
     0     0   64.02604    0  153   53.00000   64.02604  20.8%     -    0s
H    0     0                      55.0000000   64.02604  16.4%     -    0s
     0     0   63.73340    0  153   55.00000   63.73340  15.9%     -    0s
     0     0   63.47995    0  154   55.00000   63.47995  15.4%     -    0s
     0     0   63.32870    0  149   55.00000   63.32870  15.1%     -    0s
     0     0   63.29960    0  151   55.00000   63.29960  15.1%     -    0s
     0     0   63.29960    0  151   55.00000   63.29960  15.1%     -    0s
     0     2   63.29376    0  151   55.00000   63.29376  15.1%     -    0s
*   17    15              11      56.0000000   63.29376  13.0%  43.0    0s
H   31    17                      57.0000000   63.05564  10.6%  37.3    0s
*   41    17              13      58.0000000   63.05564  8.72%  33.6    0s

Cutting planes:
  Gomory: 1
  Zero half: 119

Explored 492 nodes (16713 simplex iterations) in 0.66 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.800000000000e+01, best bound 5.800000000000e+01, gap 0.0%