Gurobi 5.0.1 (linux64) logging started Thu Jan 17 23:16:24 2013

Optimize a model with 320 rows, 4160 columns and 8340 nonzeros
Presolve removed 40 rows and 60 columns
Presolve time: 0.01s
Presolved: 280 rows, 4100 columns, 8200 nonzeros
Variable types: 4080 continuous, 20 integer (20 binary)

Root relaxation: objective 3.860476e+04, 430 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 38707.2876    0    3          - 38707.2876     -      -    0s
     0     0 38731.6358    0    3          - 38731.6358     -      -    0s
     0     0 38748.8704    0    3          - 38748.8704     -      -    0s
     0     0 38753.0852    0    3          - 38753.0852     -      -    0s
     0     0 38753.8750    0    3          - 38753.8750     -      -    0s
     0     0 38756.3606    0    3          - 38756.3606     -      -    0s
     0     0 38757.6882    0    3          - 38757.6882     -      -    0s
     0     0 38758.0846    0    3          - 38758.0846     -      -    0s
     0     0 38759.8358    0    3          - 38759.8358     -      -    0s
     0     0 38761.5985    0    3          - 38761.5985     -      -    0s
     0     0 38762.7688    0    3          - 38762.7688     -      -    0s
     0     0 38762.7688    0    3          - 38762.7688     -      -    0s
H    0     0                    39452.594278 38762.7688  1.75%     -    0s
     0     2 38765.8290    0    3 39452.5943 38765.8290  1.74%     -    0s
*    6     2               6    38852.147852 38814.3604  0.10%  13.5    0s

Cutting planes:
  Flow cover: 17

Explored 9 nodes (773 simplex iterations) in 0.19 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.885214785166e+04, best bound 3.885214785166e+04, gap 0.0%