Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:44:22 2012

Optimize a model with 684 rows, 161 columns and 1368 nonzeros
Presolve removed 148 rows and 0 columns
Presolve time: 0.00s
Presolved: 536 rows, 161 columns, 1164 nonzeros
Variable types: 0 continuous, 161 integer (161 binary)
Found heuristic solution: objective 49.0000000

Root relaxation: objective 6.500000e+01, 285 iterations, 0.01 seconds

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

     0     0   65.00000    0  128   49.00000   65.00000  32.7%     -    0s
     0     0   64.50000    0  125   49.00000   64.50000  31.6%     -    0s
     0     0   63.87500    0  150   49.00000   63.87500  30.4%     -    0s
     0     0   63.26190    0  155   49.00000   63.26190  29.1%     -    0s
     0     0   62.54290    0  160   49.00000   62.54290  27.6%     -    0s
     0     0   62.02434    0  161   49.00000   62.02434  26.6%     -    0s
H    0     0                      50.0000000   62.02434  24.0%     -    0s
     0     0   61.65521    0  160   50.00000   61.65521  23.3%     -    0s
     0     0   61.55420    0  159   50.00000   61.55420  23.1%     -    0s
     0     0   61.40738    0  160   50.00000   61.40738  22.8%     -    0s
     0     0   61.31423    0  160   50.00000   61.31423  22.6%     -    0s
     0     0   61.15705    0  159   50.00000   61.15705  22.3%     -    0s
     0     0   61.03012    0  161   50.00000   61.03012  22.1%     -    0s
     0     0   60.94537    0  160   50.00000   60.94537  21.9%     -    0s
     0     0   60.87747    0  160   50.00000   60.87747  21.8%     -    0s
     0     0   60.74312    0  160   50.00000   60.74312  21.5%     -    0s
     0     0   60.67853    0  161   50.00000   60.67853  21.4%     -    0s
     0     0   60.65286    0  160   50.00000   60.65286  21.3%     -    0s
H    0     0                      51.0000000   60.65286  18.9%     -    0s
     0     0   60.55369    0  160   51.00000   60.55369  18.7%     -    0s
     0     0   60.52175    0  161   51.00000   60.52175  18.7%     -    0s
     0     0   60.52175    0  161   51.00000   60.52175  18.7%     -    0s
     0     2   60.52123    0  161   51.00000   60.52123  18.7%     -    0s
H  122    68                      52.0000000   59.37838  14.2%  47.1    0s
   612   255   53.80000   11  160   52.00000   57.92232  11.4%  39.1    5s
H 1985   533                      53.0000000   56.99034  7.53%  33.9    7s
  4570   462   54.00000   24   92   53.00000   55.00000  3.77%  27.6   10s

Cutting planes:
  Gomory: 2
  Zero half: 66

Explored 5369 nodes (141388 simplex iterations) in 10.55 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%