Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:55:46 2013

Optimize a model with 480 rows, 5420 columns and 14620 nonzeros
Presolve removed 20 rows and 500 columns
Presolve time: 0.01s
Presolved: 460 rows, 4920 columns, 13820 nonzeros
Variable types: 4820 continuous, 100 integer (100 binary)

Root relaxation: objective 3.894400e+04, 504 iterations, 0.01 seconds

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

     0     0 38944.0027    0    6          - 38944.0027     -      -    0s
     0     0 38971.6370    0    6          - 38971.6370     -      -    0s
     0     0 38971.6370    0    6          - 38971.6370     -      -    0s
     0     0 38972.3551    0    6          - 38972.3551     -      -    0s
     0     0 38972.9494    0    6          - 38972.9494     -      -    0s
     0     0 38973.7926    0    6          - 38973.7926     -      -    0s
     0     0 38973.7926    0    6          - 38973.7926     -      -    0s
     0     0 38973.7926    0    6          - 38973.7926     -      -    0s
     0     0 38973.7926    0    6          - 38973.7926     -      -    0s
     0     0 38973.7926    0    6          - 38973.7926     -      -    0s
H    0     0                    43314.971045 38973.7926  10.0%     -    0s
     0     2 38977.7256    0    6 43314.9710 38977.7256  10.0%     -    0s
*   21    13              20    39522.348769 39224.7731  0.75%  14.3    0s
*   49    27              17    39461.849271 39243.2010  0.55%   9.8    0s
H   54     2                    39252.122380 39246.3764  0.01%   8.9    0s
*   59     0               7    39246.875698 39246.8757   0.0%   8.6    0s

Cutting planes:
  Flow cover: 5

Explored 60 nodes (1552 simplex iterations) in 0.34 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924687569829e+04, best bound 3.924687569829e+04, gap 0.0%