Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:50:43 2013

Optimize a model with 41728 rows, 41088 columns and 163968 nonzeros
Presolve removed 64 rows and 0 columns
Presolve time: 0.18s
Presolved: 41664 rows, 41088 columns, 163904 nonzeros
Variable types: 41024 continuous, 64 integer (64 binary)

Root relaxation: objective 5.378978e+04, 5838 iterations, 3.66 seconds

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

     0     0 53789.7760    0   55          - 53789.7760     -      -    4s
H    0     0                    77237.000000 53789.7760  30.4%     -    6s
     0     0 68238.7859    0   12 77237.0000 68238.7859  11.7%     -    9s
H    0     0                    76288.270227 68238.7859  10.6%     -    9s
H    0     0                    74545.000000 68238.7859  8.46%     -    9s
     0     0 68314.0691    0    6 74545.0000 68314.0691  8.36%     -   10s
H    0     0                    69720.152385 68314.0691  2.02%     -   10s
H    0     0                    68983.000000 68314.0691  0.97%     -   10s
H    0     0                    68474.000000 68314.0691  0.23%     -   10s
     0     0 68353.0153    0    5 68474.0000 68353.0153  0.18%     -   10s
     0     0 68358.8766    0    4 68474.0000 68358.8766  0.17%     -   10s
H    0     0                    68465.000000 68358.8766  0.16%     -   11s
     0     2 68359.6577    0    4 68465.0000 68359.6577  0.15%     -   11s
*    5     3               5    68387.000000 68386.1413  0.00%  31.4   11s

Cutting planes:
  Gomory: 1
  Implied bound: 55

Explored 6 nodes (9526 simplex iterations) in 11.65 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.838700000000e+04, best bound 6.838614132006e+04, gap 0.0013%