Gurobi 5.0.1 (linux64) logging started Mon Feb  4 17:17:01 2013

Optimize a model with 5488 rows, 1024 columns and 16896 nonzeros
Presolve removed 885 rows and 526 columns
Presolve time: 0.04s
Presolved: 4603 rows, 498 columns, 14241 nonzeros
Variable types: 15 continuous, 483 integer (483 binary)
Found heuristic solution: objective 22883.000000

Root relaxation: objective 1.850167e+04, 2515 iterations, 0.06 seconds

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

     0     0 18501.6667    0   11 22883.0000 18501.6667  19.1%     -    0s
H    0     0                    18568.000000 18501.6667  0.36%     -    0s
H    0     0                    18543.000000 18501.6667  0.22%     -    0s
H    0     0                    18526.000000 18501.6667  0.13%     -    0s
     0     0 18502.0000    0   18 18526.0000 18502.0000  0.13%     -    0s
     0     0 18502.0000    0    8 18526.0000 18502.0000  0.13%     -    0s
H    0     0                    18523.000000 18502.0000  0.11%     -    0s
H    0     0                    18518.000000 18502.0000  0.09%     -    0s
     0     0 18502.0977    0   24 18518.0000 18502.0977  0.09%     -    0s
     0     1 18502.3249    0   24 18518.0000 18502.3249  0.08%     -    0s
H    1     1                    18512.000000 18502.3249  0.05%   0.0    0s
H   19     7                    18511.000000 18508.6393  0.01%  15.8    0s

Cutting planes:
  Gomory: 4
  Cover: 1
  MIR: 20
  Zero half: 6

Explored 25 nodes (3911 simplex iterations) in 0.31 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.851100000000e+04, best bound 1.851000000000e+04, gap 0.0054%