Gurobi 5.0.1 (linux64) logging started Mon Feb  4 16:55:53 2013

Optimize a model with 4089 rows, 841 columns and 12615 nonzeros
Presolve removed 497 rows and 421 columns
Presolve time: 0.03s
Presolved: 3592 rows, 420 columns, 11218 nonzeros
Variable types: 17 continuous, 403 integer (403 binary)
Found heuristic solution: objective 13989.000000

Root relaxation: objective 8.838667e+03, 3254 iterations, 0.08 seconds

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

     0     0 8838.66667    0   10 13989.0000 8838.66667  36.8%     -    0s
H    0     0                    8852.0000000 8838.66667  0.15%     -    0s
H    0     0                    8851.0000000 8838.66667  0.14%     -    0s
     0     0 8839.64172    0   27 8851.00000 8839.64172  0.13%     -    0s
     0     0 8839.64172    0    9 8851.00000 8839.64172  0.13%     -    0s
     0     0 8839.88283    0   22 8851.00000 8839.88283  0.13%     -    0s
     0     0 8839.97864    0   34 8851.00000 8839.97864  0.12%     -    0s
     0     0 8840.09740    0   37 8851.00000 8840.09740  0.12%     -    0s
H    0     0                    8850.0000000 8840.09740  0.11%     -    0s
     0     0 8840.46054    0   37 8850.00000 8840.46054  0.11%     -    0s
     0     2 8840.55924    0   37 8850.00000 8840.55924  0.11%     -    0s
H    1     2                    8846.0000000 8840.55924  0.06%   0.0    0s
*   54    17              36    8845.0000000 8841.88385  0.04%  20.2    0s

Cutting planes:
  Gomory: 7
  Cover: 4
  MIR: 38
  Zero half: 16

Explored 190 nodes (6154 simplex iterations) in 0.39 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.845000000000e+03, best bound 8.845000000000e+03, gap 0.0%