Gurobi 5.0.1 (linux64) logging started Sun Dec  9 06:10:59 2012

Optimize a model with 570 rows, 540 columns and 1789 nonzeros
Presolve removed 22 rows and 13 columns
Presolve time: 0.01s
Presolved: 548 rows, 527 columns, 1737 nonzeros
Variable types: 351 continuous, 176 integer (176 binary)

Root relaxation: objective 4.767899e+04, 265 iterations, 0.00 seconds

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

     0     0 47678.9929    0   82          - 47678.9929     -      -    0s
H    0     0                    76198.000000 47678.9929  37.4%     -    0s
     0     0 57319.6813    0   16 76198.0000 57319.6813  24.8%     -    0s
H    0     0                    61233.000000 57319.6813  6.39%     -    0s
     0     0 57689.7838    0   13 61233.0000 57689.7838  5.79%     -    0s
     0     0 57707.0823    0    7 61233.0000 57707.0823  5.76%     -    0s
     0     0 57724.6040    0    7 61233.0000 57724.6040  5.73%     -    0s
     0     2 57729.5063    0    7 61233.0000 57729.5063  5.72%     -    0s
*   21    17              17    58166.000000 57729.5063  0.75%   2.3    0s
*   55    26              16    58139.000000 57803.6081  0.58%   2.9    1s
*   74    21              10    58027.000000 57821.0233  0.35%   3.0    1s
*   92    15               9    57998.000000 57846.7686  0.26%   3.0    1s
H  113    15                    57991.000000 57859.2925  0.23%   2.8    1s
*  129    12               8    57988.000000 57869.9574  0.20%   2.7    2s
*  136    11              10    57942.000000 57885.0640  0.10%   2.8    2s
*  137     3               9    57897.000000 57885.0640  0.02%   2.7    2s

Cutting planes:
  Gomory: 23
  Cover: 2
  Implied bound: 1
  Flow cover: 67
  Flow path: 38

Explored 141 nodes (783 simplex iterations) in 2.31 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.789700000000e+04, best bound 5.789700000000e+04, gap 0.0%