Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:27:29 2013

Optimize a model with 34278 rows, 33698 columns and 134618 nonzeros
Presolve removed 2375 rows and 0 columns
Presolve time: 0.21s
Presolved: 31903 rows, 33698 columns, 129868 nonzeros
Variable types: 33640 continuous, 58 integer (58 binary)

Root relaxation: objective 5.131973e+04, 4617 iterations, 0.55 seconds

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

     0     0 51319.7334    0    5          - 51319.7334     -      -    0s
H    0     0                    51990.000000 51319.7334  1.29%     -    0s
H    0     0                    51425.000000 51319.7334  0.20%     -    1s
     0     0 51321.2408    0    6 51425.0000 51321.2408  0.20%     -    1s
     0     0 51351.2089    0    3 51425.0000 51351.2089  0.14%     -    1s
     0     0 51351.2089    0    2 51425.0000 51351.2089  0.14%     -    2s
     0     0 51351.3156    0    3 51425.0000 51351.3156  0.14%     -    2s
     0     0 51351.3156    0    3 51425.0000 51351.3156  0.14%     -    2s
     0     0 51385.2838    0    4 51425.0000 51385.2838  0.08%     -    3s
     0     0 51414.1111    0    1 51425.0000 51414.1111  0.02%     -    3s
*    0     0               0    51420.000000 51420.0000   0.0%     -    3s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 0 nodes (6371 simplex iterations) in 3.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.142000000000e+04, best bound 5.142000000000e+04, gap 0.0%