Gurobi 5.0.1 (linux64) logging started Thu Jan 17 23:16:27 2013

Optimize a model with 320 rows, 4140 columns and 8380 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.01s
Presolved: 300 rows, 4120 columns, 8300 nonzeros
Variable types: 4100 continuous, 20 integer (20 binary)

Root relaxation: objective 3.894400e+04, 477 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    2          - 38944.0027     -      -    0s
H    0     0                    39929.302785 38944.0027  2.47%     -    0s
     0     0 39030.4489    0    2 39929.3028 39030.4489  2.25%     -    0s
     0     0 39047.4561    0    2 39929.3028 39047.4561  2.21%     -    0s
     0     0 39051.6713    0    2 39929.3028 39051.6713  2.20%     -    0s
     0     0 39057.7153    0    2 39929.3028 39057.7153  2.18%     -    0s
     0     0 39058.3190    0    2 39929.3028 39058.3190  2.18%     -    0s
     0     0 39058.3190    0    2 39929.3028 39058.3190  2.18%     -    0s
     0     0 39058.3190    0    2 39929.3028 39058.3190  2.18%     -    0s
     0     0 39058.3190    0    2 39929.3028 39058.3190  2.18%     -    0s
H    0     0                    39223.441147 39058.3190  0.42%     -    0s
     0     1 39197.7362    0    1 39223.4411 39197.7362  0.07%     -    0s

Cutting planes:
  Flow cover: 11

Explored 2 nodes (753 simplex iterations) in 0.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.922344114676e+04, best bound 3.922344114676e+04, gap 0.0%