Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:37:34 2013

Optimize a model with 37942 rows, 37332 columns and 148962 nonzeros
Presolve removed 61 rows and 0 columns
Presolve time: 0.16s
Presolved: 37881 rows, 37332 columns, 148901 nonzeros
Variable types: 37271 continuous, 61 integer (61 binary)

Root relaxation: objective 5.057008e+04, 4556 iterations, 1.85 seconds

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

     0     0 50570.0758    0   47          - 50570.0758     -      -    2s
H    0     0                    71584.000000 50570.0758  29.4%     -    3s
     0     0 59752.6662    0   13 71584.0000 59752.6662  16.5%     -    6s
H    0     0                    65268.000000 59752.6662  8.45%     -    6s
     0     0 61190.4242    0    3 65268.0000 61190.4242  6.25%     -    7s
H    0     0                    64699.580808 61190.4242  5.42%     -    7s
H    0     0                    63561.000000 61190.4242  3.73%     -    7s
     0     0 61244.6511    0    5 63561.0000 61244.6511  3.64%     -    8s
     0     0 61323.1933    0    4 63561.0000 61323.1933  3.52%     -    8s
H    0     0                    63048.160895 61323.1933  2.74%     -    8s
H    0     0                    62217.000000 61323.1933  1.44%     -    8s
H    0     0                    61434.000000 61323.1933  0.18%     -    8s
     0     2 61342.6436    0    4 61434.0000 61342.6436  0.15%     -    9s
*    5     4               4    61425.000000 61417.0000  0.01%  78.6    9s

Cutting planes:
  Gomory: 1
  Implied bound: 55

Explored 7 nodes (9660 simplex iterations) in 9.89 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.142500000000e+04, best bound 6.142101980198e+04, gap 0.0065%