Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:03:16 2013

Optimize a model with 45694 rows, 45024 columns and 179694 nonzeros
Presolve removed 67 rows and 0 columns
Presolve time: 0.20s
Presolved: 45627 rows, 45024 columns, 179627 nonzeros
Variable types: 44957 continuous, 67 integer (67 binary)

Root relaxation: objective 5.375264e+04, 5010 iterations, 2.82 seconds

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

     0     0 53752.6399    0   53          - 53752.6399     -      -    3s
H    0     0                    77430.000000 53752.6399  30.6%     -    4s
     0     0 64952.2697    0   21 77430.0000 64952.2697  16.1%     -    9s
H    0     0                    72113.000000 64952.2697  9.93%     -    9s
     0     0 66650.7315    0    5 72113.0000 66650.7315  7.57%     -   11s
H    0     0                    71558.000000 66650.7315  6.86%     -   11s
H    0     0                    67132.000000 66650.7315  0.72%     -   11s
     0     0 67001.6325    0    4 67132.0000 67001.6325  0.19%     -   12s
     0     0 67045.6806    0    2 67132.0000 67045.6806  0.13%     -   13s
     0     0 67059.7659    0    3 67132.0000 67059.7659  0.11%     -   13s
     0     0 67060.1667    0    2 67132.0000 67060.1667  0.11%     -   13s
     0     0 67060.1667    0   39 67132.0000 67060.1667  0.11%     -   16s
     0     0 67060.1667    0    8 67132.0000 67060.1667  0.11%     -   20s
     0     0 67060.1667    0    2 67132.0000 67060.1667  0.11%     -   21s
     0     0 67113.8599    0    2 67132.0000 67113.8599  0.03%     -   21s
     0     0 67128.0876    0    2 67132.0000 67128.0876  0.01%     -   21s

Cutting planes:
  Gomory: 2
  Implied bound: 43

Explored 0 nodes (17714 simplex iterations) in 21.96 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.713200000000e+04, best bound 6.712808755760e+04, gap 0.0058%