Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:38 2012

Optimize a model with 563 rows, 146 columns and 1126 nonzeros
Presolve removed 120 rows and 0 columns
Presolve time: 0.00s
Presolved: 443 rows, 146 columns, 957 nonzeros
Variable types: 0 continuous, 146 integer (146 binary)
Found heuristic solution: objective 44.0000000

Root relaxation: objective 5.950000e+01, 237 iterations, 0.00 seconds

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

     0     0   59.50000    0  111   44.00000   59.50000  35.2%     -    0s
     0     0   58.64286    0  142   44.00000   58.64286  33.3%     -    0s
H    0     0                      46.0000000   58.64286  27.5%     -    0s
     0     0   57.86957    0  139   46.00000   57.86957  25.8%     -    0s
H    0     0                      47.0000000   57.86957  23.1%     -    0s
     0     0   57.58857    0  138   47.00000   57.58857  22.5%     -    0s
H    0     0                      48.0000000   57.58857  20.0%     -    0s
     0     0   56.75000    0  136   48.00000   56.75000  18.2%     -    0s
     0     0   56.25197    0  143   48.00000   56.25197  17.2%     -    0s
     0     0   56.12031    0  143   48.00000   56.12031  16.9%     -    0s
     0     0   56.06898    0  143   48.00000   56.06898  16.8%     -    0s
     0     0   56.04325    0  143   48.00000   56.04325  16.8%     -    0s
     0     0   56.04325    0  142   48.00000   56.04325  16.8%     -    0s
     0     2   56.04325    0  141   48.00000   56.04325  16.8%     -    0s
*   20    14              11      49.0000000   56.02455  14.3%  37.0    0s
H   31    18                      51.0000000   55.80645  9.42%  39.0    0s

Cutting planes:
  Zero half: 107

Explored 383 nodes (13162 simplex iterations) in 0.50 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%