Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:08:50 2013

Optimize a model with 68 rows, 2066 columns and 24148 nonzeros
Presolve removed 22 rows and 24 columns
Presolve time: 0.16s
Presolved: 46 rows, 2042 columns, 22102 nonzeros
Variable types: 2022 continuous, 20 integer (20 binary)

Root relaxation: objective 3.881594e+03, 15 iterations, 0.00 seconds

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

     0     0 3881.59364    0    3          - 3881.59364     -      -    0s
     0     0 3881.86365    0    3          - 3881.86365     -      -    0s
     0     0 3882.33064    0    3          - 3882.33064     -      -    0s
     0     0 3882.34195    0    3          - 3882.34195     -      -    0s
     0     0 3882.72006    0    4          - 3882.72006     -      -    0s
     0     0 3891.94239    0    3          - 3891.94239     -      -    0s
     0     0 3893.18049    0    3          - 3893.18049     -      -    0s
     0     0 3893.65692    0    3          - 3893.65692     -      -    0s
     0     0 3893.87057    0    3          - 3893.87057     -      -    0s
     0     0 3893.87057    0    3          - 3893.87057     -      -    0s
     0     0 3893.87057    0    3          - 3893.87057     -      -    0s
     0     0 3893.87282    0    5          - 3893.87282     -      -    0s
     0     0 3893.87411    0    6          - 3893.87411     -      -    0s
     0     0 3893.87485    0    6          - 3893.87485     -      -    0s
H    0     0                    3893.9001900 3893.87485  0.00%     -    0s

Cutting planes:
  Cover: 1
  Implied bound: 1
  Flow cover: 3

Explored 0 nodes (119 simplex iterations) in 0.91 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893900189954e+03, best bound 3.893874849522e+03, gap 0.0007%