Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:20 2013

Optimize a model with 56 rows, 260 columns and 1930 nonzeros
Presolve removed 22 rows and 26 columns
Presolve time: 0.00s
Presolved: 34 rows, 234 columns, 1680 nonzeros
Variable types: 220 continuous, 14 integer (14 binary)

Root relaxation: objective 4.440467e+03, 13 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          - 4440.46714     -      -    0s
     0     0 4443.85913    0    4          - 4443.85913     -      -    0s
     0     0 4446.78799    0    3          - 4446.78799     -      -    0s
     0     0 4457.09998    0    3          - 4457.09998     -      -    0s
     0     0 4457.09998    0    3          - 4457.09998     -      -    0s
     0     0 4457.09998    0    3          - 4457.09998     -      -    0s
H    0     0                    4460.1195954 4457.09998  0.07%     -    0s
     0     0 4458.13898    0    3 4460.11960 4458.13898  0.04%     -    0s
     0     0 4458.57158    0    3 4460.11960 4458.57158  0.03%     -    0s
H    0     0                    4458.9422153 4458.57158  0.01%     -    0s

Cutting planes:
  Flow cover: 1

Explored 0 nodes (79 simplex iterations) in 0.04 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458942215307e+03, best bound 4.458571583976e+03, gap 0.0083%