Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:54:50 2013

Optimize a model with 20875 rows, 2500 columns and 63750 nonzeros
Presolve removed 4178 rows and 1324 columns
Presolve time: 0.16s
Presolved: 16697 rows, 1176 columns, 50882 nonzeros
Variable types: 17 continuous, 1159 integer (1159 binary)
Found heuristic solution: objective 46617.000000

Root relaxation: objective 3.750537e+04, 4930 iterations, 0.23 seconds

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

     0     0 37505.3714    0    8 46617.0000 37505.3714  19.5%     -    0s
H    0     0                    37517.000000 37505.3714  0.03%     -    0s
H    0     0                    37509.000000 37505.3714  0.01%     -    0s

Explored 0 nodes (4942 simplex iterations) in 0.45 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.750900000000e+04, best bound 3.750600000000e+04, gap 0.0080%