Gurobi 5.0.1 (linux64) logging started Sun Dec  9 06:10:57 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                    78123.000000 47104.6783  39.7%     -    0s
     0     0 56520.1097    0   17 78123.0000 56520.1097  27.7%     -    0s
     0     0 56785.2784    0   12 78123.0000 56785.2784  27.3%     -    0s
     0     0 56929.9922    0   15 78123.0000 56929.9922  27.1%     -    0s
     0     0 57008.3358    0   10 78123.0000 57008.3358  27.0%     -    0s
H    0     0                    58409.000000 57008.3358  2.40%     -    0s
     0     2 57008.9226    0   10 58409.0000 57008.9226  2.40%     -    0s
*   37    24              33    58033.000000 57010.7032  1.76%   2.8    0s
*   45    12               7    57218.000000 57020.2958  0.35%   2.8    0s
*   72    14              14    57137.000000 57030.0336  0.19%   2.6    0s
*   87    15              14    57135.000000 57063.0188  0.13%   2.5    0s
*   89     9              15    57109.000000 57063.0188  0.08%   2.4    0s

Cutting planes:
  Gomory: 15
  Cover: 1
  Flow cover: 55
  Flow path: 40

Explored 106 nodes (655 simplex iterations) in 0.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.710900000000e+04, best bound 5.710900000000e+04, gap 0.0%