Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:35:53 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 5.531357e+04, 5431 iterations, 2.06 seconds

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

     0     0 55313.5667    0   49          - 55313.5667     -      -    2s
H    0     0                    82160.000000 55313.5667  32.7%     -    4s
     0     0 66176.6375    0   11 82160.0000 66176.6375  19.5%     -    7s
H    0     0                    77448.160750 66176.6375  14.6%     -    7s
H    0     0                    73077.000000 66176.6375  9.44%     -    7s
H    0     0                    72838.000000 66176.6375  9.15%     -    7s
     0     0 67455.1948    0    7 72838.0000 67455.1948  7.39%     -    7s
H    0     0                    71289.000000 67455.1948  5.38%     -    8s
     0     0 67965.1106    0    3 71289.0000 67965.1106  4.66%     -    8s
H    0     0                    70789.689899 67965.1106  3.99%     -    8s
H    0     0                    69766.000000 67965.1106  2.58%     -    8s
H    0     0                    68130.000000 67965.1106  0.24%     -    8s
     0     2 67968.0273    0    3 68130.0000 67968.0273  0.24%     -    9s
*    6     4               5    68107.000000 68079.2167  0.04%  68.8    9s
*    8     2               4    68097.000000 68079.2167  0.03%  61.2    9s

Cutting planes:
  Implied bound: 59

Explored 11 nodes (10556 simplex iterations) in 9.39 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%