Gurobi 5.0.1 (linux64) logging started Thu Jan 17 23:16:35 2013

Optimize a model with 280 rows, 4100 columns and 8200 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.00s
Presolved: 320 rows, 4120 columns, 8260 nonzeros
Variable types: 4080 continuous, 40 integer (40 binary)

Root relaxation: objective 3.894400e+04, 458 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    4          - 38944.0027     -      -    0s
H    0     0                    40315.764124 38944.0027  3.40%     -    0s
H    0     0                    39929.302785 38944.0027  2.47%     -    0s
     0     0 39030.4489    0    4 39929.3028 39030.4489  2.25%     -    0s
     0     0 39047.4561    0    4 39929.3028 39047.4561  2.21%     -    0s
     0     0 39051.3729    0    4 39929.3028 39051.3729  2.20%     -    0s
     0     0 39057.6146    0    4 39929.3028 39057.6146  2.18%     -    0s
     0     0 39057.6146    0    4 39929.3028 39057.6146  2.18%     -    0s
     0     0 39058.3190    0    4 39929.3028 39058.3190  2.18%     -    0s
     0     0 39058.3190    0    4 39929.3028 39058.3190  2.18%     -    0s
     0     2 39059.7678    0    4 39929.3028 39059.7678  2.18%     -    0s
*    4     3               3    39785.760162 39213.2780  1.44%  44.0    0s
*    7     1               5    39223.441147 39223.4411   0.0%  27.7    0s

Cutting planes:
  Flow cover: 12

Explored 8 nodes (821 simplex iterations) in 0.09 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%