Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:41:26 2012

Optimize a model with 616 rows, 158 columns and 1232 nonzeros
Presolve removed 126 rows and 0 columns
Presolve time: 0.00s
Presolved: 490 rows, 158 columns, 1055 nonzeros
Variable types: 0 continuous, 158 integer (158 binary)
Found heuristic solution: objective 48.0000000

Root relaxation: objective 6.500000e+01, 261 iterations, 0.00 seconds

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

     0     0   65.00000    0  126   48.00000   65.00000  35.4%     -    0s
     0     0   63.34314    0  156   48.00000   63.34314  32.0%     -    0s
H    0     0                      51.0000000   63.34314  24.2%     -    0s
     0     0   62.19581    0  154   51.00000   62.19581  22.0%     -    0s
     0     0   61.65771    0  158   51.00000   61.65771  20.9%     -    0s
     0     0   61.56159    0  158   51.00000   61.56159  20.7%     -    0s
     0     0   61.35537    0  157   51.00000   61.35537  20.3%     -    0s
     0     0   61.22688    0  157   51.00000   61.22688  20.1%     -    0s
     0     0   61.18541    0  156   51.00000   61.18541  20.0%     -    0s
     0     0   61.03665    0  157   51.00000   61.03665  19.7%     -    0s
     0     0   60.92136    0  158   51.00000   60.92136  19.5%     -    0s
     0     0   60.90749    0  158   51.00000   60.90749  19.4%     -    0s
     0     0   60.90749    0  156   51.00000   60.90749  19.4%     -    0s
     0     2   60.90506    0  156   51.00000   60.90506  19.4%     -    0s
H   43    24                      54.0000000   60.70402  12.4%  37.3    0s
  1829   308     cutoff   29        54.00000   57.12000  5.78%  32.8    5s

Cutting planes:
  Gomory: 3
  Zero half: 53

Explored 3098 nodes (87214 simplex iterations) in 6.49 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0%