Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:54:44 2013

Optimize a model with 20875 rows, 2500 columns and 63750 nonzeros
Presolve removed 2821 rows and 1287 columns
Presolve time: 0.16s
Presolved: 18054 rows, 1213 columns, 55195 nonzeros
Variable types: 22 continuous, 1191 integer (1191 binary)
Found heuristic solution: objective 53636.000000

Root relaxation: objective 4.003162e+04, 6346 iterations, 0.32 seconds

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

     0     0 40031.6181    0   11 53636.0000 40031.6181  25.4%     -    0s
H    0     0                    40051.000000 40031.6181  0.05%     -    0s
H    0     0                    40050.000000 40031.6181  0.05%     -    0s
H    0     0                    40046.000000 40031.6181  0.04%     -    0s
     0     0 40034.2254    0   21 40046.0000 40034.2254  0.03%     -    0s
     0     0 40034.2254    0    9 40046.0000 40034.2254  0.03%     -    0s
H    0     0                    40044.000000 40034.2254  0.02%     -    0s
     0     0 40034.2845    0   21 40044.0000 40034.2845  0.02%     -    0s
     0     0 40035.9424    0   27 40044.0000 40035.9424  0.02%     -    0s
H    0     0                    40040.000000 40035.9424  0.01%     -    0s
     0     1 40036.0082    0   27 40040.0000 40036.0082  0.01%     -    0s

Cutting planes:
  MIR: 12

Explored 1 nodes (7776 simplex iterations) in 0.76 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.004000000000e+04, best bound 4.003700000000e+04, gap 0.0075%