Gurobi 5.0.1 (linux64) logging started Sun Dec  9 06:10:54 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
     0     0 57689.7838    0   13 76198.0000 57689.7838  24.3%     -    0s
     0     0 57707.0823    0    7 76198.0000 57707.0823  24.3%     -    0s
     0     0 57724.6040    0    7 76198.0000 57724.6040  24.2%     -    0s
H    0     0                    58661.000000 57724.6040  1.60%     -    0s
     0     2 57729.5063    0    7 58661.0000 57729.5063  1.59%     -    0s
*   21    16              17    58166.000000 57729.5063  0.75%   2.1    0s
*   78    32              18    58139.000000 57803.6081  0.58%   2.7    0s
*  129    41              10    58128.000000 57846.7686  0.48%   2.8    0s
*  145    44              17    58080.000000 57869.9574  0.36%   2.8    0s
*  147    30              15    58035.000000 57869.9574  0.28%   2.8    0s
*  154     9               9    57897.000000 57885.0640  0.02%   2.8    0s

Cutting planes:
  Gomory: 18
  Cover: 2
  Implied bound: 1
  Flow cover: 54
  Flow path: 28

Explored 159 nodes (834 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.789700000000e+04, best bound 5.789595028178e+04, gap 0.0018%