Gurobi 5.0.1 (linux64) logging started Sun Dec  9 06:11:29 2012

Optimize a model with 570 rows, 540 columns and 1788 nonzeros
Presolve removed 21 rows and 12 columns
Presolve time: 0.01s
Presolved: 549 rows, 528 columns, 1740 nonzeros
Variable types: 351 continuous, 177 integer (177 binary)

Root relaxation: objective 4.710468e+04, 273 iterations, 0.00 seconds

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

     0     0 47104.6783    0   92          - 47104.6783     -      -    0s
H    0     0                    79423.000000 47104.6783  40.7%     -    0s
     0     0 56520.1097    0   17 79423.0000 56520.1097  28.8%     -    0s
     0     0 56785.2784    0   12 79423.0000 56785.2784  28.5%     -    0s
     0     0 56929.9922    0   15 79423.0000 56929.9922  28.3%     -    0s
     0     0 57008.3358    0   10 79423.0000 57008.3358  28.2%     -    0s
H    0     0                    58409.000000 57008.3358  2.40%     -    0s
     0     2 57008.9226    0   10 58409.0000 57008.9226  2.40%     -    0s
*   21    17              18    57946.000000 57010.7032  1.61%   3.3    0s
H   27    10                    57257.000000 57020.2958  0.41%   3.1    0s
*   29    10               7    57218.000000 57020.2958  0.35%   3.1    0s
*   49    13              14    57137.000000 57030.2976  0.19%   3.0    0s
H   62    15                    57135.000000 57048.2824  0.15%   2.8    1s
*   65     9              15    57109.000000 57048.2824  0.11%   2.7    1s

Cutting planes:
  Gomory: 18
  Cover: 1
  Flow cover: 59
  Flow path: 42

Explored 83 nodes (622 simplex iterations) in 1.52 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.710900000000e+04, best bound 5.710687687802e+04, gap 0.0037%