Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:43:34 2013

Optimize a model with 40383 rows, 39753 columns and 158823 nonzeros
Presolve removed 3265 rows and 0 columns
Presolve time: 0.24s
Presolved: 37118 rows, 39753 columns, 152293 nonzeros
Variable types: 39690 continuous, 63 integer (63 binary)

Root relaxation: objective 6.163920e+04, 6161 iterations, 0.93 seconds

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

     0     0 61639.2000    0    1          - 61639.2000     -      -    1s
H    0     0                    61963.000000 61639.2000  0.52%     -    1s
     0     0 61640.7478    0    2 61963.0000 61640.7478  0.52%     -    1s
     0     0 61640.7478    0    1 61963.0000 61640.7478  0.52%     -    2s
     0     0 61640.8629    0    2 61963.0000 61640.8629  0.52%     -    3s
     0     0 61640.8731    0    2 61963.0000 61640.8731  0.52%     -    3s
     0     2 61642.3897    0    2 61963.0000 61642.3897  0.52%     -    3s
*    6     1               6    61778.000000 61773.9946  0.01%  41.5    4s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 7 nodes (9072 simplex iterations) in 4.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.177800000000e+04, best bound 6.177399458570e+04, gap 0.0065%