Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:55:38 2013

Optimize a model with 680 rows, 5240 columns and 11220 nonzeros
Presolve removed 40 rows and 60 columns
Presolve time: 0.03s
Presolved: 640 rows, 5180 columns, 10360 nonzeros
Variable types: 4800 continuous, 380 integer (380 binary)

Root relaxation: objective 3.860476e+04, 496 iterations, 0.01 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 38654.1580    0    5          - 38654.1580     -      -    0s
     0     0 38666.4547    0    5          - 38666.4547     -      -    0s
     0     0 38671.8958    0    5          - 38671.8958     -      -    0s
     0     0 38671.9977    0    5          - 38671.9977     -      -    0s
     0     0 38672.0391    0    5          - 38672.0391     -      -    0s
     0     0 38672.0391    0    5          - 38672.0391     -      -    0s
H    0     0                    39284.770630 38672.0391  1.56%     -    0s
     0     2 38673.4904    0    5 39284.7706 38673.4904  1.56%     -    0s
*    8     7               6    38860.951623 38760.0941  0.26%  19.2    0s
*   19     5               9    38860.914280 38772.5747  0.23%  15.4    0s

Cutting planes:
  Gomory: 3
  Flow cover: 16

Explored 35 nodes (1121 simplex iterations) in 0.26 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886091427998e+04, best bound 3.885897570778e+04, gap 0.0050%