Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:20 2013

Optimize a model with 52 rows, 312 columns and 1906 nonzeros
Presolve removed 22 rows and 82 columns
Presolve time: 0.00s
Presolved: 30 rows, 230 columns, 1658 nonzeros
Variable types: 218 continuous, 12 integer (12 binary)
Found heuristic solution: objective 4462.2073927

Root relaxation: objective 4.440467e+03, 12 iterations, 0.00 seconds

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

     0     0 4440.46714    0    3 4462.20739 4440.46714  0.49%     -    0s
     0     0 4446.78799    0    3 4462.20739 4446.78799  0.35%     -    0s
     0     0 4446.78799    0    3 4462.20739 4446.78799  0.35%     -    0s
     0     0 4457.08218    0    2 4462.20739 4457.08218  0.11%     -    0s
     0     2 4458.74197    0    2 4462.20739 4458.74197  0.08%     -    0s
H    1     2                    4460.1133602 4458.74197  0.03%   6.0    0s
*   13     6              12    4458.9368320 4458.93683   0.0%   5.5    0s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 14 nodes (143 simplex iterations) in 0.04 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458936831960e+03, best bound 4.458936831960e+03, gap 0.0%