Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:26:40 2013

Optimize a model with 64 rows, 1064 columns and 11142 nonzeros
Presolve removed 22 rows and 26 columns
Presolve time: 0.03s
Presolved: 42 rows, 1038 columns, 10092 nonzeros
Variable types: 1020 continuous, 18 integer (18 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 4442.02841    0    3          - 4442.02841     -      -    0s
     0     0 4446.78799    0    3          - 4446.78799     -      -    0s
     0     0 4456.06532    0    3          - 4456.06532     -      -    0s
     0     0 4456.06532    0    3          - 4456.06532     -      -    0s
     0     0 4456.06532    0    3          - 4456.06532     -      -    0s
     0     0 4456.08724    0    3          - 4456.08724     -      -    0s
     0     0 4457.93139    0    3          - 4457.93139     -      -    0s
     0     0 4458.64721    0    3          - 4458.64721     -      -    0s
     0     0 4458.64721    0    3          - 4458.64721     -      -    0s
     0     2 4458.65899    0    3          - 4458.65899     -      -    0s
*   12     4              11    4459.6084056 4458.65899  0.02%   4.3    0s
*   15     3              11    4459.1370253 4458.65899  0.01%   3.7    0s
*   21     4               5    4458.9448988 4458.67218  0.01%   3.2    0s

Cutting planes:
  Flow cover: 2

Explored 22 nodes (163 simplex iterations) in 0.29 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458944898839e+03, best bound 4.458672180873e+03, gap 0.0061%