Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:06:53 2013

Optimize a model with 8473 rows, 1369 columns and 26011 nonzeros
Presolve removed 929 rows and 694 columns
Presolve time: 0.06s
Presolved: 7544 rows, 675 columns, 23176 nonzeros
Variable types: 16 continuous, 659 integer (659 binary)
Found heuristic solution: objective 25647.000000

Root relaxation: objective 1.890732e+04, 2191 iterations, 0.07 seconds

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

     0     0 18907.3190    0   10 25647.0000 18907.3190  26.3%     -    0s
H    0     0                    18923.000000 18907.3190  0.08%     -    0s
     0     0 18908.8317    0   24 18923.0000 18908.8317  0.07%     -    0s
     0     0 18908.8317    0   11 18923.0000 18908.8317  0.07%     -    0s
     0     0 18909.0994    0   36 18923.0000 18909.0994  0.07%     -    0s
H    0     0                    18922.000000 18909.0994  0.07%     -    0s
H    0     0                    18920.000000 18909.0994  0.06%     -    0s
     0     0 18910.0693    0   39 18920.0000 18910.0693  0.05%     -    0s
     0     2 18910.2635    0   39 18920.0000 18910.2635  0.05%     -    0s
H   64    35                    18917.000000 18911.0882  0.03%  15.6    0s
H   86    32                    18915.000000 18911.1550  0.02%  14.1    0s

Cutting planes:
  Gomory: 6
  Cover: 10
  MIR: 34
  Zero half: 13

Explored 729 nodes (9706 simplex iterations) in 0.74 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.891500000000e+04, best bound 1.891400000000e+04, gap 0.0053%