Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:15:56 2013

Optimize a model with 480 rows, 4640 columns and 9620 nonzeros
Presolve removed 40 rows and 60 columns
Presolve time: 0.02s
Presolved: 440 rows, 4580 columns, 9160 nonzeros
Variable types: 4400 continuous, 180 integer (180 binary)

Root relaxation: objective 3.839329e+04, 461 iterations, 0.01 seconds

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

     0     0 38393.2919    0    2          - 38393.2919     -      -    0s
     0     0 38421.2826    0    2          - 38421.2826     -      -    0s
     0     0 38496.1491    0    2          - 38496.1491     -      -    0s
     0     0 38500.9491    0    2          - 38500.9491     -      -    0s
     0     0 38504.0881    0    2          - 38504.0881     -      -    0s
     0     0 38505.1368    0    2          - 38505.1368     -      -    0s
     0     0 38506.3491    0    2          - 38506.3491     -      -    0s
     0     0 38506.9865    0    2          - 38506.9865     -      -    0s
     0     0 38508.8233    0    2          - 38508.8233     -      -    0s
     0     0 38510.1491    0    2          - 38510.1491     -      -    0s
     0     0 38510.1491    0    2          - 38510.1491     -      -    0s
H    0     0                    41815.387401 38510.1491  7.90%     -    0s
     0     2 38514.8090    0    2 41815.3874 38514.8090  7.89%     -    0s
*   14     8              13    38662.033233 38553.7271  0.28%  10.9    0s
*   25     7              11    38645.657009 38587.1267  0.15%   8.6    0s
*   40     3               9    38634.233867 38621.6954  0.03%   8.0    0s

Cutting planes:
  Flow cover: 11

Explored 45 nodes (868 simplex iterations) in 0.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.863423386685e+04, best bound 3.863423386685e+04, gap 0.0%