Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:18 2013

Optimize a model with 56 rows, 570 columns and 4110 nonzeros
Presolve removed 22 rows and 139 columns
Presolve time: 0.01s
Presolved: 34 rows, 431 columns, 3660 nonzeros
Variable types: 417 continuous, 14 integer (14 binary)

Root relaxation: objective 5.281733e+03, 14 iterations, 0.00 seconds

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

     0     0 5281.73269    0    4          - 5281.73269     -      -    0s
H    0     0                    5298.8613415 5281.73269  0.32%     -    0s
     0     0 5284.41193    0    4 5298.86134 5284.41193  0.27%     -    0s
     0     0 5284.41193    0    4 5298.86134 5284.41193  0.27%     -    0s
     0     0 5294.85366    0    6 5298.86134 5294.85366  0.08%     -    0s
     0     2 5296.19251    0    6 5298.86134 5296.19251  0.05%     -    0s
*   20     5              18    5296.3109775 5296.31098   0.0%   5.1    0s

Cutting planes:
  Gomory: 3
  Flow cover: 2

Explored 21 nodes (178 simplex iterations) in 0.07 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.296310977461e+03, best bound 5.296310977461e+03, gap 0.0%