Gurobi 5.0.1 (linux64) logging started Mon Feb  4 16:55:50 2013

Optimize a model with 4089 rows, 841 columns and 12615 nonzeros
Presolve removed 946 rows and 444 columns
Presolve time: 0.02s
Presolved: 3143 rows, 397 columns, 9741 nonzeros
Variable types: 12 continuous, 385 integer (385 binary)
Found heuristic solution: objective 21484.000000

Root relaxation: objective 1.867052e+04, 1794 iterations, 0.04 seconds

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

     0     0 18670.5161    0    3 21484.0000 18670.5161  13.1%     -    0s
H    0     0                    18689.000000 18670.5161  0.10%     -    0s
H    0     0                    18673.000000 18670.5161  0.01%     -    0s
     0     0 18670.9635    0   13 18673.0000 18670.9635  0.01%     -    0s
     0     0 18670.9635    0    6 18673.0000 18670.9635  0.01%     -    0s
     0     0 18670.9635    0   12 18673.0000 18670.9635  0.01%     -    0s
     0     0     cutoff    0      18673.0000 18672.0187  0.01%     -    0s

Cutting planes:
  Cover: 2
  Implied bound: 1
  Clique: 5
  MIR: 8

Explored 0 nodes (1868 simplex iterations) in 0.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.867300000000e+04, best bound 1.867300000000e+04, gap 0.0%