Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:54:37 2013

Optimize a model with 20875 rows, 2500 columns and 63750 nonzeros
Presolve removed 2269 rows and 1278 columns
Presolve time: 0.16s
Presolved: 18606 rows, 1222 columns, 56711 nonzeros
Variable types: 19 continuous, 1203 integer (1203 binary)
Found heuristic solution: objective 62703.000000

Root relaxation: objective 5.163108e+04, 4243 iterations, 0.22 seconds

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

     0     0 51631.0769    0   10 62703.0000 51631.0769  17.7%     -    0s
H    0     0                    51655.000000 51631.0769  0.05%     -    0s
H    0     0                    51644.000000 51631.0769  0.03%     -    0s
H    0     0                    51637.000000 51631.0769  0.01%     -    0s
     0     0 51631.0769    0   16 51637.0000 51631.0769  0.01%     -    0s
     0     0 51631.0769    0   11 51637.0000 51631.0769  0.01%     -    0s
     0     0 51632.0000    0   20 51637.0000 51632.0000  0.01%     -    0s

Cutting planes:
  Gomory: 6
  Cover: 1
  Implied bound: 4
  Clique: 1
  MIR: 10
  Zero half: 1

Explored 0 nodes (4688 simplex iterations) in 0.68 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.163700000000e+04, best bound 5.163200000000e+04, gap 0.0097%