Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:57:48 2013

Optimize a model with 34279 rows, 3481 columns and 104430 nonzeros
Presolve removed 4658 rows and 1805 columns
Presolve time: 0.25s
Presolved: 29621 rows, 1676 columns, 89920 nonzeros
Variable types: 19 continuous, 1657 integer (1657 binary)
Found heuristic solution: objective 82920.000000

Root relaxation: objective 6.858917e+04, 7058 iterations, 0.42 seconds

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

     0     0 68589.1653    0    8 82920.0000 68589.1653  17.3%     -    0s
H    0     0                    68600.000000 68589.1653  0.02%     -    0s
H    0     0                    68597.000000 68589.1653  0.01%     -    0s
     0     0 68592.0455    0   15 68597.0000 68592.0455  0.01%     -    0s

Cutting planes:
  Gomory: 3
  Implied bound: 1
  MIR: 8
  Zero half: 2

Explored 0 nodes (7146 simplex iterations) in 0.87 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.859700000000e+04, best bound 6.859300000000e+04, gap 0.0058%