Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:34:12 2013

Optimize a model with 36720 rows, 36120 columns and 144120 nonzeros
Presolve removed 60 rows and 0 columns
Presolve time: 0.16s
Presolved: 36660 rows, 36120 columns, 144060 nonzeros
Variable types: 36060 continuous, 60 integer (60 binary)

Root relaxation: objective 5.432804e+04, 4566 iterations, 2.32 seconds

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

     0     0 54328.0398    0   51          - 54328.0398     -      -    2s
H    0     0                    74816.000000 54328.0398  27.4%     -    3s
     0     0 66610.1330    0    8 74816.0000 66610.1330  11.0%     -    6s
H    0     0                    74377.000000 66610.1330  10.4%     -    6s
     0     0 68206.1159    0    3 74377.0000 68206.1159  8.30%     -    7s
H    0     0                    69860.850679 68206.1159  2.37%     -    7s
H    0     0                    68756.000000 68206.1159  0.80%     -    7s
H    0     0                    68511.101695 68206.1159  0.45%     -    8s
H    0     0                    68454.000000 68206.1159  0.36%     -    8s
     0     2 68211.9403    0    3 68454.0000 68211.9403  0.35%     -    8s
*   22     0               7    68446.000000 68446.0000   0.0%   107    9s

Cutting planes:
  Implied bound: 55

Explored 23 nodes (11415 simplex iterations) in 9.84 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.844600000000e+04, best bound 6.844600000000e+04, gap 0.0%