Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:41 2012

Optimize a model with 555 rows, 540 columns and 1780 nonzeros
Presolve removed 40 rows and 24 columns
Presolve time: 0.01s
Presolved: 515 rows, 516 columns, 1684 nonzeros
Variable types: 344 continuous, 172 integer (172 binary)

Root relaxation: objective 4.833708e+04, 274 iterations, 0.00 seconds

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

     0     0 48337.0786    0   94          - 48337.0786     -      -    0s
     0     0 59758.5418    0   33          - 59758.5418     -      -    0s
     0     0 60267.7002    0   28          - 60267.7002     -      -    0s
     0     0 60417.3388    0   20          - 60417.3388     -      -    0s
     0     0 60437.4533    0   17          - 60437.4533     -      -    0s
     0     0 60439.8273    0   20          - 60439.8273     -      -    0s
H    0     0                    81683.000000 60439.8273  26.0%     -    0s
     0     2 60443.3568    0   20 81683.0000 60443.3568  26.0%     -    0s
H   27    24                    61317.000000 60443.3568  1.42%   5.2    0s
*  151    75              37    60945.000000 60481.5740  0.76%   5.2    0s
*  372   170              34    60944.000000 60523.5299  0.69%   4.9    0s
H  389   166                    60909.000000 60530.9473  0.62%   4.9    0s
*  463   116              27    60737.000000 60542.4829  0.32%   4.7    0s
H  747    96                    60734.000000 60699.5172  0.06%   5.2    0s

Cutting planes:
  Gomory: 8
  Cover: 4
  Implied bound: 1
  Flow cover: 45
  Flow path: 33

Explored 784 nodes (4481 simplex iterations) in 0.45 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.073400000000e+04, best bound 6.072963316792e+04, gap 0.0072%