Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:07:58 2013

Optimize a model with 2028 rows, 6044 columns and 16082 nonzeros
Presolve removed 827 rows and 2443 columns
Presolve time: 0.19s
Presolved: 1201 rows, 3601 columns, 7202 nonzeros
Variable types: 2406 continuous, 1195 integer (1195 binary)

Root relaxation: objective 5.497312e+03, 5 iterations, 0.00 seconds

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

     0     0 5497.31217    0    1          - 5497.31217     -      -    0s
H    0     0                    5511.5775912 5497.31217  0.26%     -    0s
     0     0 5503.59038    0    2 5511.57759 5503.59038  0.14%     -    0s
     0     0 5503.59243    0    2 5511.57759 5503.59243  0.14%     -    0s
H    0     0                    5503.9234267 5503.59243  0.01%     -    0s

Cutting planes:
  Cover: 1
  Flow cover: 1

Explored 0 nodes (203 simplex iterations) in 0.27 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.503923426740e+03, best bound 5.503592430327e+03, gap 0.0060%