Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:33:28 2013

Optimize a model with 36660 rows, 36060 columns and 144060 nonzeros
Presolve removed 1847 rows and 0 columns
Presolve time: 0.22s
Presolved: 34813 rows, 36060 columns, 140366 nonzeros
Variable types: 36000 continuous, 60 integer (60 binary)

Root relaxation: objective 6.070207e+04, 5882 iterations, 0.76 seconds

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

     0     0 60702.0714    0    4          - 60702.0714     -      -    1s
H    0     0                    62733.000000 60702.0714  3.24%     -    1s
     0     0 60704.4360    0    6 62733.0000 60704.4360  3.23%     -    1s
     0     0 60704.4728    0    6 62733.0000 60704.4728  3.23%     -    1s
     0     0 60704.4753    0    6 62733.0000 60704.4753  3.23%     -    2s
     0     2 60729.4669    0    6 62733.0000 60729.4669  3.19%     -    2s
H    2     2                    61437.736842 60833.3722  0.98%   109    3s
H    4     3                    61412.318584 60838.2351  0.93%   228    3s
H    5     3                    61140.000000 60838.2351  0.49%   199    3s
*    6     4               5    60972.000000 60838.2351  0.22%   178    3s

Cutting planes:
  Gomory: 3
  Flow cover: 6

Explored 11 nodes (7529 simplex iterations) in 3.49 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.097200000000e+04, best bound 6.097200000000e+04, gap 0.0%