Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:59:17 2013

Optimize a model with 39773 rows, 3844 columns and 121086 nonzeros
Presolve removed 4705 rows and 1973 columns
Presolve time: 0.31s
Presolved: 35068 rows, 1871 columns, 106912 nonzeros
Variable types: 29 continuous, 1842 integer (1842 binary)
Found heuristic solution: objective 71617.000000

Root relaxation: objective 5.281547e+04, 18187 iterations, 1.49 seconds

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

     0     0 52815.4667    0   22 71617.0000 52815.4667  26.3%     -    1s
H    0     0                    52831.000000 52815.4667  0.03%     -    1s
H    0     0                    52824.000000 52815.4667  0.02%     -    2s
     0     0 52817.0447    0   17 52824.0000 52817.0447  0.01%     -    2s
     0     0 52817.0447    0   18 52824.0000 52817.0447  0.01%     -    2s
     0     0 52817.0447    0   31 52824.0000 52817.0447  0.01%     -    2s
     0     0 52817.5833    0   20 52824.0000 52817.5833  0.01%     -    2s
     0     2 52817.6444    0   20 52824.0000 52817.6444  0.01%     -    2s

Cutting planes:
  Gomory: 3
  MIR: 20
  Zero half: 3

Explored 12 nodes (21519 simplex iterations) in 2.71 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.282400000000e+04, best bound 5.281900000000e+04, gap 0.0095%