Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:34:10 2013

Optimize a model with 660 rows, 36060 columns and 72060 nonzeros
Presolve time: 0.05s
Presolved: 660 rows, 36060 columns, 72060 nonzeros
Variable types: 36000 continuous, 60 integer (60 binary)

Root relaxation: objective 6.781935e+04, 1431 iterations, 0.04 seconds

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

     0     0 67819.3475    0    5          - 67819.3475     -      -    0s
H    0     0                    69494.000000 67819.3475  2.41%     -    0s
H    0     0                    68130.000000 67819.3475  0.46%     -    0s
     0     0 67937.1288    0    5 68130.0000 67937.1288  0.28%     -    0s
     0     0 67937.1288    0    5 68130.0000 67937.1288  0.28%     -    0s
     0     0 67937.7926    0    5 68130.0000 67937.7926  0.28%     -    0s
     0     0 67954.7342    0    3 68130.0000 67954.7342  0.26%     -    0s
     0     0 67960.2622    0    4 68130.0000 67960.2622  0.25%     -    0s
     0     0 67963.5283    0    3 68130.0000 67963.5283  0.24%     -    0s
     0     0 67965.3598    0    3 68130.0000 67965.3598  0.24%     -    0s
     0     0 67968.3628    0    3 68130.0000 67968.3628  0.24%     -    0s
     0     0 67968.3628    0    3 68130.0000 67968.3628  0.24%     -    0s
     0     2 67968.4147    0    3 68130.0000 67968.4147  0.24%     -    0s
*    6     2               5    68097.000000 68084.2656  0.02%  53.7    0s

Cutting planes:
  Implied bound: 40
  Flow cover: 4

Explored 9 nodes (3495 simplex iterations) in 0.95 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.809700000000e+04, best bound 6.809700000000e+04, gap 0.0%