Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:49:34 2013

Optimize a model with 2280 rows, 10040 columns and 24020 nonzeros
Presolve removed 40 rows and 60 columns
Presolve time: 0.22s
Presolved: 2240 rows, 9980 columns, 19960 nonzeros
Variable types: 8000 continuous, 1980 integer (1980 binary)

Root relaxation: objective 3.860476e+04, 518 iterations, 0.03 seconds

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

     0     0 38604.7615    0    3          - 38604.7615     -      -    0s
     0     0 38621.9422    0    6          - 38621.9422     -      -    0s
     0     0 38623.7593    0    6          - 38623.7593     -      -    0s
     0     0 38624.2059    0    6          - 38624.2059     -      -    0s
     0     0 38624.4686    0    6          - 38624.4686     -      -    0s
     0     0 38624.4686    0    6          - 38624.4686     -      -    0s
     0     2 38626.9052    0    6          - 38626.9052     -      -    1s
*   90    59              88    38867.667704 38697.4494  0.44%   3.6    2s
*  241    77              11    38864.187546 38772.6297  0.24%   7.7    2s
*  262    70              10    38861.053354 38774.5189  0.22%   8.1    2s

Cutting planes:
  Gomory: 3
  Flow cover: 13

Explored 496 nodes (6154 simplex iterations) in 3.78 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886105335407e+04, best bound 3.885744590808e+04, gap 0.0093%