Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:33:10 2013

Optimize a model with 36660 rows, 36060 columns and 144060 nonzeros
Presolve removed 2489 rows and 0 columns
Presolve time: 0.21s
Presolved: 34171 rows, 36060 columns, 139082 nonzeros
Variable types: 36000 continuous, 60 integer (60 binary)

Root relaxation: objective 7.248481e+04, 7209 iterations, 1.00 seconds

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

     0     0 72484.8097    0    4          - 72484.8097     -      -    1s
H    0     0                    73157.000000 72484.8097  0.92%     -    1s
H    0     0                    72699.000000 72484.8097  0.29%     -    1s
     0     0 72490.1616    0    6 72699.0000 72490.1616  0.29%     -    1s
     0     0 72490.1616    0    4 72699.0000 72490.1616  0.29%     -    2s
     0     0 72490.1616    0    6 72699.0000 72490.1616  0.29%     -    2s
     0     0 72490.1621    0    6 72699.0000 72490.1621  0.29%     -    3s
     0     0 72490.1621    0    6 72699.0000 72490.1621  0.29%     -    3s
     0     0 72490.3221    0    6 72699.0000 72490.3221  0.29%     -    3s
     0     0 72516.3015    0    4 72699.0000 72516.3015  0.25%     -    3s
     0     2 72516.6226    0    4 72699.0000 72516.6226  0.25%     -    4s
*    6     3               5    72635.000000 72556.3465  0.11%  43.0    4s

Cutting planes:
  Gomory: 2
  Flow cover: 6

Explored 11 nodes (11506 simplex iterations) in 4.38 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.263500000000e+04, best bound 7.263500000000e+04, gap 0.0%