Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:48:13 2013

Optimize a model with 4280 rows, 8040 columns and 24020 nonzeros
Presolve removed 60 rows and 40 columns
Presolve time: 0.18s
Presolved: 4220 rows, 8000 columns, 19960 nonzeros
Variable types: 6020 continuous, 1980 integer (1980 binary)

Root relaxation: objective 3.894400e+04, 1983 iterations, 0.04 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
     0     0 39057.5450    0    2          - 39057.5450     -      -    0s
     0     0 39061.8674    0    2          - 39061.8674     -      -    0s
     0     0 39069.1119    0    2          - 39069.1119     -      -    0s
     0     0 39080.6246    0    2          - 39080.6246     -      -    0s
     0     0 39082.8396    0    2          - 39082.8396     -      -    0s
     0     0 39083.1061    0    2          - 39083.1061     -      -    0s
     0     0 39083.3378    0    2          - 39083.3378     -      -    0s
H    0     0                    39313.039040 39083.3378  0.58%     -    0s
     0     0 39083.3378    0    2 39313.0390 39083.3378  0.58%     -    0s
     0     0 39083.3378    0    4 39313.0390 39083.3378  0.58%     -    0s
     0     0 39083.3378    0    3 39313.0390 39083.3378  0.58%     -    0s
     0     0 39083.8787    0    3 39313.0390 39083.8787  0.58%     -    0s
     0     0 39084.3945    0    2 39313.0390 39084.3945  0.58%     -    0s
     0     0 39084.5115    0    3 39313.0390 39084.5115  0.58%     -    0s
     0     0 39084.5115    0    3 39313.0390 39084.5115  0.58%     -    0s
     0     2 39086.1239    0    3 39313.0390 39086.1239  0.58%     -    1s
H   36    20                    39252.282935 39101.5914  0.38%   6.9    1s
H   39    21                    39252.270258 39101.5914  0.38%   7.2    1s
*   40    19              37    39250.071548 39101.5914  0.38%   8.7    1s
H  645    22                    39250.007569 39243.5942  0.02%   5.9    2s
H  646    22                    39249.937850 39243.5942  0.02%   5.9    2s
H  647    17                    39248.768606 39243.5942  0.01%   5.9    2s
*  648    13              37    39247.713225 39243.5942  0.01%   6.0    2s

Cutting planes:
  Gomory: 1
  Flow cover: 14

Explored 650 nodes (7251 simplex iterations) in 2.15 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924771322516e+04, best bound 3.924390239436e+04, gap 0.0097%