Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:19 2013

Optimize a model with 56 rows, 570 columns and 4110 nonzeros
Presolve removed 22 rows and 142 columns
Presolve time: 0.01s
Presolved: 34 rows, 428 columns, 3654 nonzeros
Variable types: 414 continuous, 14 integer (14 binary)

Root relaxation: objective 5.497312e+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 5497.31217    0    4          - 5497.31217     -      -    0s
     0     0 5498.51917    0    4          - 5498.51917     -      -    0s
     0     0 5498.55216    0    4          - 5498.55216     -      -    0s
     0     0 5503.91830    0    1          - 5503.91830     -      -    0s
     0     0 5503.91830    0    1          - 5503.91830     -      -    0s
H    0     0                    5503.9213056 5503.91830  0.00%     -    0s

Cutting planes:
  Flow cover: 1

Explored 0 nodes (43 simplex iterations) in 0.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.503921305563e+03, best bound 5.503918298172e+03, gap 0.0001%