Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:11 2012

Optimize a model with 541 rows, 144 columns and 1082 nonzeros
Presolve removed 101 rows and 0 columns
Presolve time: 0.00s
Presolved: 440 rows, 144 columns, 946 nonzeros
Variable types: 0 continuous, 144 integer (144 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 6.100000e+01, 224 iterations, 0.00 seconds

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

     0     0   61.00000    0  106   51.00000   61.00000  19.6%     -    0s
     0     0   60.38889    0  140   51.00000   60.38889  18.4%     -    0s
     0     0   59.06918    0  141   51.00000   59.06918  15.8%     -    0s
     0     0   58.26855    0  140   51.00000   58.26855  14.3%     -    0s
     0     0   57.63413    0  142   51.00000   57.63413  13.0%     -    0s
     0     0   57.50965    0  144   51.00000   57.50965  12.8%     -    0s
     0     0   57.42993    0  144   51.00000   57.42993  12.6%     -    0s
     0     0   57.26024    0  142   51.00000   57.26024  12.3%     -    0s
     0     0   57.13999    0  142   51.00000   57.13999  12.0%     -    0s
     0     0   57.00596    0  141   51.00000   57.00596  11.8%     -    0s
     0     0   56.98966    0  142   51.00000   56.98966  11.7%     -    0s
     0     0   56.98966    0  142   51.00000   56.98966  11.7%     -    0s
     0     2   56.98868    0  142   51.00000   56.98868  11.7%     -    0s
*   18     9              13      52.0000000   56.98868  9.59%  38.2    0s

Cutting planes:
  Zero half: 118

Explored 332 nodes (12330 simplex iterations) in 0.50 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%