Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:49:47 2013

Optimize a model with 2280 rows, 10040 columns and 24020 nonzeros
Presolve removed 40 rows and 60 columns
Presolve time: 0.19s
Presolved: 2240 rows, 9980 columns, 19960 nonzeros
Variable types: 8000 continuous, 1980 integer (1980 binary)

Root relaxation: objective 3.894400e+04, 521 iterations, 0.02 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 38983.4630    0    4          - 38983.4630     -      -    0s
     0     0 38986.7633    0    4          - 38986.7633     -      -    0s
     0     0 38991.4901    0    4          - 38991.4901     -      -    0s
     0     0 38993.0813    0    4          - 38993.0813     -      -    0s
     0     0 38993.7865    0    4          - 38993.7865     -      -    0s
     0     0 38994.4423    0    4          - 38994.4423     -      -    0s
     0     0 38996.3934    0    4          - 38996.3934     -      -    0s
     0     0 38997.3143    0    4          - 38997.3143     -      -    0s
     0     0 38997.8616    0    4          - 38997.8616     -      -    0s
     0     0 38997.8618    0    4          - 38997.8618     -      -    0s
     0     0 38997.8618    0    4          - 38997.8618     -      -    0s
     0     2 38999.8012    0    4          - 38999.8012     -      -    1s
*  318    57             316    39372.898676 39075.8503  0.75%   1.7    3s
H  320    31                    39297.743514 39075.8503  0.56%   1.7    3s
H  347    49                    39266.260881 39183.5936  0.21%   1.9    3s
*  352    46              18    39266.061886 39183.5936  0.21%   1.9    3s
*  483   118              17    39263.930528 39220.4575  0.11%   2.4    3s
*  517   117              13    39261.973883 39222.3123  0.10%   2.4    3s
*  601   129              13    39260.215173 39225.1238  0.09%   2.5    3s
   714   151 39234.0723    9    3 39260.2152 39228.0150  0.08%   2.5    5s
H  759   171                    39250.071548 39228.0150  0.06%   4.2    5s
*  765   158              27    39250.007569 39228.0150  0.06%   4.2    5s
* 1290    13              28    39247.713225 39243.6468  0.01%   3.4    7s
* 1296    11              28    39247.130682 39243.7230  0.01%   3.4    7s

Cutting planes:
  Gomory: 1
  Flow cover: 5

Explored 1297 nodes (5459 simplex iterations) in 7.14 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924713068171e+04, best bound 3.924372304948e+04, gap 0.0087%