Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:15:30 2013

Optimize a model with 27664 rows, 27144 columns and 108264 nonzeros
Presolve removed 52 rows and 0 columns
Presolve time: 0.12s
Presolved: 27612 rows, 27144 columns, 108212 nonzeros
Variable types: 27092 continuous, 52 integer (52 binary)

Root relaxation: objective 5.742059e+04, 5291 iterations, 2.08 seconds

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

     0     0 57420.5920    0   44          - 57420.5920     -      -    2s
H    0     0                    73351.000000 57420.5920  21.7%     -    3s
     0     0 68061.6680    0    8 73351.0000 68061.6680  7.21%     -    4s
H    0     0                    72863.707118 68061.6680  6.59%     -    4s
H    0     0                    71115.000000 68061.6680  4.29%     -    4s
     0     0 68355.9000    0    2 71115.0000 68355.9000  3.88%     -    5s
H    0     0                    69374.750000 68355.9000  1.47%     -    5s
H    0     0                    68806.000000 68355.9000  0.65%     -    5s
H    0     0                    68404.000000 68355.9000  0.07%     -    5s

Cutting planes:
  Implied bound: 46
  MIR: 1

Explored 0 nodes (8447 simplex iterations) in 5.48 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.840400000000e+04, best bound 6.840400000000e+04, gap 0.0%