Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:03:07 2013

Optimize a model with 20745 rows, 20295 columns and 81045 nonzeros
Presolve removed 2161 rows and 0 columns
Presolve time: 0.12s
Presolved: 18584 rows, 20295 columns, 76723 nonzeros
Variable types: 20250 continuous, 45 integer (45 binary)

Root relaxation: objective 5.261897e+04, 3996 iterations, 0.37 seconds

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

     0     0 52618.9670    0    6          - 52618.9670     -      -    0s
H    0     0                    53191.000000 52618.9670  1.08%     -    0s
     0     0 52621.0912    0    6 53191.0000 52621.0912  1.07%     -    0s
     0     0 52621.0922    0    7 53191.0000 52621.0922  1.07%     -    0s
     0     0 52621.3128    0    5 53191.0000 52621.3128  1.07%     -    1s
H    0     0                    53147.596048 52621.3128  0.99%     -    1s
     0     0 52621.3128    0    6 53147.5960 52621.3128  0.99%     -    2s
     0     0 52621.3128    0    5 53147.5960 52621.3128  0.99%     -    2s
H    0     0                    52984.000000 52621.3128  0.68%     -    2s
     0     0 52621.3128    0    5 52984.0000 52621.3128  0.68%     -    2s
     0     2 52622.8395    0    5 52984.0000 52622.8395  0.68%     -    2s
H    5     4                    52784.000000 52668.8113  0.22%  45.4    2s
*    7     4               6    52754.000000 52668.8113  0.16%  50.9    3s
*    9     1               5    52714.000000 52687.8517  0.05%  50.7    3s

Cutting planes:
  Gomory: 1
  Flow cover: 6

Explored 11 nodes (6782 simplex iterations) in 3.05 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.271400000000e+04, best bound 5.271400000000e+04, gap 0.0%