Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:02:42 2013

Optimize a model with 60 rows, 1084 columns and 8914 nonzeros
Presolve removed 22 rows and 250 columns
Presolve time: 0.03s
Presolved: 38 rows, 834 columns, 8066 nonzeros
Variable types: 818 continuous, 16 integer (16 binary)

Root relaxation: objective 4.440467e+03, 16 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    5          - 4440.46714     -      -    0s
     0     0 4442.90283    0    5          - 4442.90283     -      -    0s
     0     0 4442.90283    0    5          - 4442.90283     -      -    0s
H    0     0                    4464.8953779 4442.90283  0.49%     -    0s
     0     0 4446.78799    0    5 4464.89538 4446.78799  0.41%     -    0s
     0     0 4449.72038    0    5 4464.89538 4449.72038  0.34%     -    0s
     0     0 4457.08218    0    4 4464.89538 4457.08218  0.17%     -    0s
     0     0 4457.08218    0    4 4464.89538 4457.08218  0.17%     -    0s
     0     2 4457.08218    0    4 4464.89538 4457.08218  0.17%     -    0s
*    6     6               6    4462.2175892 4457.08218  0.12%   5.7    0s
*   16     1               5    4458.9448858 4458.94489   0.0%   4.7    0s

Cutting planes:
  Implied bound: 2
  Flow cover: 4

Explored 17 nodes (181 simplex iterations) in 0.17 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458944885800e+03, best bound 4.458944885800e+03, gap 0.0%