Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:21:45 2013

Optimize a model with 30910 rows, 30360 columns and 121110 nonzeros
Presolve removed 55 rows and 0 columns
Presolve time: 0.13s
Presolved: 30855 rows, 30360 columns, 121055 nonzeros
Variable types: 30305 continuous, 55 integer (55 binary)

Root relaxation: objective 5.551904e+04, 6023 iterations, 2.90 seconds

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

     0     0 55519.0396    0   47          - 55519.0396     -      -    3s
H    0     0                    78029.000000 55519.0396  28.8%     -    4s
     0     0 66813.6458    0    8 78029.0000 66813.6458  14.4%     -    7s
H    0     0                    70650.534286 66813.6458  5.43%     -    7s
H    0     0                    68978.000000 66813.6458  3.14%     -    7s
H    0     0                    67268.000000 66813.6458  0.68%     -    7s
     0     0 67191.2025    0    3 67268.0000 67191.2025  0.11%     -    7s
     0     0 67257.1176    0    1 67268.0000 67257.1176  0.02%     -    7s
     0     0 67257.1176    0   40 67268.0000 67257.1176  0.02%     -   10s
     0     0 67257.1176    0    1 67268.0000 67257.1176  0.02%     -   12s
     0     0 67257.1176    0    1 67268.0000 67257.1176  0.02%     -   13s
     0     0     cutoff    0      67268.0000 67268.0000   0.0%     -   13s

Cutting planes:
  Gomory: 3
  Implied bound: 39

Explored 0 nodes (17186 simplex iterations) in 13.39 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.726800000000e+04, best bound 6.726800000000e+04, gap 0.0%