Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:41:35 2013

Optimize a model with 520 rows, 6720 columns and 26260 nonzeros
Presolve removed 20 rows and 580 columns
Presolve time: 0.03s
Presolved: 500 rows, 6140 columns, 24260 nonzeros
Variable types: 6020 continuous, 120 integer (120 binary)

Root relaxation: objective 3.839329e+04, 474 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    6          - 38393.2919     -      -    0s
     0     0 38399.3540    0    6          - 38399.3540     -      -    0s
     0     0 38400.3842    0    5          - 38400.3842     -      -    0s
     0     0 38404.4041    0    9          - 38404.4041     -      -    0s
     0     0 38404.5260    0    5          - 38404.5260     -      -    0s
     0     0 38416.0518    0   11          - 38416.0518     -      -    0s
     0     0 38419.3142    0   12          - 38419.3142     -      -    0s
     0     0 38420.0980    0   12          - 38420.0980     -      -    0s
     0     0 38420.1277    0   12          - 38420.1277     -      -    0s
     0     0 38420.4623    0   12          - 38420.4623     -      -    0s
     0     0 38420.5898    0   12          - 38420.5898     -      -    0s
     0     0 38420.5898    0   12          - 38420.5898     -      -    0s
H    0     0                    41715.448315 38420.5898  7.90%     -    0s
     0     2 38438.9584    0   12 41715.4483 38438.9584  7.85%     -    0s
H   27    13                    38638.274112 38517.9174  0.31%   9.4    0s
*   37     6              13    38634.712282 38631.3706  0.01%   7.6    0s

Cutting planes:
  Flow cover: 10

Explored 38 nodes (1033 simplex iterations) in 0.56 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.863471228242e+04, best bound 3.863137064766e+04, gap 0.0086%