Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:07:39 2013

Optimize a model with 4028 rows, 4044 columns and 16082 nonzeros
Presolve removed 2112 rows and 2118 columns
Presolve time: 0.16s
Presolved: 1916 rows, 1926 columns, 5762 nonzeros
Variable types: 971 continuous, 955 integer (955 binary)

Root relaxation: objective 5.497312e+03, 770 iterations, 0.02 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                    5503.9234267 5497.31217  0.12%     -    0s
     0     0 5503.92335    0    2 5503.92343 5503.92335  0.00%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 2

Explored 0 nodes (788 simplex iterations) in 0.21 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.503923426738e+03, best bound 5.503923350752e+03, gap 0.0000%