Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:55:11 2013

Optimize a model with 23478 rows, 2704 columns and 71656 nonzeros
Presolve removed 3185 rows and 1398 columns
Presolve time: 0.16s
Presolved: 20293 rows, 1306 columns, 61761 nonzeros
Variable types: 18 continuous, 1288 integer (1288 binary)
Found heuristic solution: objective 67241.000000

Root relaxation: objective 5.630262e+04, 4364 iterations, 0.24 seconds

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

     0     0 56302.6233    0    6 67241.0000 56302.6233  16.3%     -    0s
H    0     0                    56311.000000 56302.6233  0.01%     -    0s
H    0     0                    56310.000000 56302.6233  0.01%     -    0s
     0     0 56305.4453    0   16 56310.0000 56305.4453  0.01%     -    0s

Cutting planes:
  Gomory: 3
  Implied bound: 1
  MIR: 4

Explored 0 nodes (4430 simplex iterations) in 0.55 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.631000000000e+04, best bound 5.630600000000e+04, gap 0.0071%