Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:54:47 2013

Optimize a model with 20875 rows, 2500 columns and 63750 nonzeros
Presolve removed 2055 rows and 1270 columns
Presolve time: 0.14s
Presolved: 18820 rows, 1230 columns, 57494 nonzeros
Variable types: 22 continuous, 1208 integer (1208 binary)
Found heuristic solution: objective 58842.000000

Root relaxation: objective 4.723365e+04, 4309 iterations, 0.23 seconds

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

     0     0 47233.6500    0    5 58842.0000 47233.6500  19.7%     -    0s
H    0     0                    47245.000000 47233.6500  0.02%     -    0s
H    0     0                    47241.000000 47233.6500  0.02%     -    0s
H    0     0                    47240.000000 47233.6500  0.01%     -    0s
     0     0 47235.8508    0   18 47240.0000 47235.8508  0.01%     -    0s

Cutting planes:
  Gomory: 2
  Implied bound: 1
  MIR: 4

Explored 0 nodes (4396 simplex iterations) in 0.56 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.724000000000e+04, best bound 4.723600000000e+04, gap 0.0085%