Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:40:40 2013

Optimize a model with 320 rows, 6120 columns and 57310 nonzeros
Presolve removed 10 rows and 10 columns
Presolve time: 0.12s
Presolved: 310 rows, 6110 columns, 52300 nonzeros
Variable types: 6020 continuous, 90 integer (90 binary)

Root relaxation: objective 1.836170e+04, 109 iterations, 0.00 seconds

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

     0     0 18361.7044    0    3          - 18361.7044     -      -    0s
     0     0 18361.8111    0    3          - 18361.8111     -      -    0s
     0     0 18381.2294    0    3          - 18381.2294     -      -    0s
     0     0 18393.7338    0   12          - 18393.7338     -      -    0s
     0     0 18412.3705    0    6          - 18412.3705     -      -    0s
     0     0 18414.1552    0    6          - 18414.1552     -      -    0s
     0     0 18414.1552    0    6          - 18414.1552     -      -    0s
     0     0 18414.1552    0    6          - 18414.1552     -      -    1s
     0     0 18414.1636    0    6          - 18414.1636     -      -    1s
     0     0 18414.1636    0    6          - 18414.1636     -      -    1s
     0     2 18414.1889    0    6          - 18414.1889     -      -    1s
*   15    10              13    18420.099414 18414.1889  0.03%   5.1    1s
H   27    10                    18418.474722 18416.2989  0.01%   3.9    1s
*   33    14              15    18418.465476 18416.2989  0.01%   3.6    1s

Cutting planes:
  Flow cover: 1

Explored 37 nodes (715 simplex iterations) in 1.70 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.841846547646e+04, best bound 1.841685629873e+04, gap 0.0087%