Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:55:14 2013

Optimize a model with 23478 rows, 2704 columns and 71656 nonzeros
Presolve removed 4585 rows and 1432 columns
Presolve time: 0.17s
Presolved: 18893 rows, 1272 columns, 57462 nonzeros
Variable types: 16 continuous, 1256 integer (1256 binary)
Found heuristic solution: objective 58922.000000

Root relaxation: objective 5.118353e+04, 4257 iterations, 0.22 seconds

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

     0     0 51183.5268    0    6 58922.0000 51183.5268  13.1%     -    0s
H    0     0                    51198.000000 51183.5268  0.03%     -    0s
H    0     0                    51189.000000 51183.5268  0.01%     -    0s
     0     0 51185.6450    0   16 51189.0000 51185.6450  0.01%     -    0s

Cutting planes:
  Gomory: 2
  Implied bound: 1
  MIR: 6
  Mod-K: 1

Explored 0 nodes (4301 simplex iterations) in 0.51 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.118900000000e+04, best bound 5.118600000000e+04, gap 0.0059%