Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:52:03 2013

Optimize a model with 640 rows, 24700 columns and 248380 nonzeros
Presolve removed 20 rows and 500 columns
Presolve time: 0.78s
Presolved: 620 rows, 24200 columns, 228380 nonzeros
Variable types: 24020 continuous, 180 integer (180 binary)

Root relaxation: objective 3.894400e+04, 665 iterations, 0.03 seconds

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

     0     0 38944.0027    0   14          - 38944.0027     -      -    1s
     0     0 38945.2579    0   14          - 38945.2579     -      -    1s
     0     0 38945.3859    0   14          - 38945.3859     -      -    1s
     0     0 38945.4033    0   14          - 38945.4033     -      -    1s
     0     0 38945.4033    0   14          - 38945.4033     -      -    1s
     0     2 38945.9820    0   14          - 38945.9820     -      -    4s
*   73    73              62    39601.409346 39006.1090  1.50%   7.6    4s
*   76    70              60    39595.548523 39006.1090  1.49%   7.4    4s
   131   109 39331.4145   13    7 39595.5485 39150.3974  1.12%   9.1    5s
*  177   117              34    39474.726455 39151.1058  0.82%   8.1    5s
*  237    17              24    39251.550320 39179.8145  0.18%   7.5    5s
*  280     9              22    39249.104754 39246.5782  0.01%   7.3    5s

Cutting planes:
  Flow cover: 6

Explored 281 nodes (3145 simplex iterations) in 5.61 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924910475388e+04, best bound 3.924657816269e+04, gap 0.0064%