Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:58:49 2013

Optimize a model with 37881 rows, 3721 columns and 115351 nonzeros
Presolve removed 3698 rows and 1896 columns
Presolve time: 0.29s
Presolved: 34183 rows, 1825 columns, 104109 nonzeros
Variable types: 27 continuous, 1798 integer (1798 binary)
Found heuristic solution: objective 68986.000000

Root relaxation: objective 5.174362e+04, 10849 iterations, 0.79 seconds

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

     0     0 51743.6154    0    9 68986.0000 51743.6154  25.0%     -    1s
H    0     0                    51754.000000 51743.6154  0.02%     -    1s
H    0     0                    51752.000000 51743.6154  0.02%     -    1s
H    0     0                    51746.000000 51743.6154  0.00%     -    1s

Explored 0 nodes (10875 simplex iterations) in 1.24 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.174600000000e+04, best bound 5.174400000000e+04, gap 0.0039%