Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:07:36 2013

Optimize a model with 4028 rows, 4044 columns and 16082 nonzeros
Presolve removed 2120 rows and 2126 columns
Presolve time: 0.10s
Presolved: 1908 rows, 1918 columns, 5738 nonzeros
Variable types: 967 continuous, 951 integer (951 binary)

Root relaxation: objective 7.659086e+03, 766 iterations, 0.02 seconds

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

     0     0 7659.08578    0    1          - 7659.08578     -      -    0s
H    0     0                    7664.6454486 7659.08578  0.07%     -    0s
     0     0 7664.64442    0    2 7664.64545 7664.64442  0.00%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 2

Explored 0 nodes (780 simplex iterations) in 0.15 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.664645448649e+03, best bound 7.664644423144e+03, gap 0.0000%