Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:08 2012

Optimize a model with 530 rows, 143 columns and 1060 nonzeros
Presolve removed 117 rows and 0 columns
Presolve time: 0.00s
Presolved: 413 rows, 143 columns, 906 nonzeros
Variable types: 0 continuous, 143 integer (143 binary)
Found heuristic solution: objective 47.0000000

Root relaxation: objective 5.916327e+01, 286 iterations, 0.00 seconds

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

     0     0   59.16327    0  137   47.00000   59.16327  25.9%     -    0s
H    0     0                      48.0000000   59.16327  23.3%     -    0s
H    0     0                      49.0000000   59.16327  20.7%     -    0s
     0     0   58.10000    0  142   49.00000   58.10000  18.6%     -    0s
     0     0   57.21739    0  133   49.00000   57.21739  16.8%     -    0s
     0     0   56.55598    0  140   49.00000   56.55598  15.4%     -    0s
     0     0   56.15714    0  142   49.00000   56.15714  14.6%     -    0s
     0     0   56.00434    0  143   49.00000   56.00434  14.3%     -    0s
     0     0   55.91556    0  143   49.00000   55.91556  14.1%     -    0s
H    0     0                      51.0000000   55.91556  9.64%     -    0s
     0     0   55.82912    0  142   51.00000   55.82912  9.47%     -    0s
     0     0   55.73605    0  141   51.00000   55.73605  9.29%     -    0s
     0     0   55.71900    0  141   51.00000   55.71900  9.25%     -    0s
     0     0   55.71900    0  141   51.00000   55.71900  9.25%     -    0s
     0     2   55.71817    0  141   51.00000   55.71817  9.25%     -    0s
*    8     8               6      52.0000000   55.48685  6.71%  51.1    0s

Cutting planes:
  Zero half: 77

Explored 136 nodes (5071 simplex iterations) in 0.26 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%