Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:08:13 2013

Optimize a model with 68 rows, 4160 columns and 52122 nonzeros
Presolve removed 22 rows and 126 columns
Presolve time: 0.31s
Presolved: 46 rows, 4034 columns, 48066 nonzeros
Variable types: 4014 continuous, 20 integer (20 binary)

Root relaxation: objective 5.497312e+03, 22 iterations, 0.00 seconds

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

     0     0 5497.31217    0    8          - 5497.31217     -      -    0s
     0     0 5497.71845    0    8          - 5497.71845     -      -    0s
     0     0 5501.36058    0    6          - 5501.36058     -      -    0s
     0     0 5501.36058    0    6          - 5501.36058     -      -    0s
H    0     0                    5511.6018336 5501.36058  0.19%     -    0s
     0     0 5503.88405    0    4 5511.60183 5503.88405  0.14%     -    0s
     0     0 5503.88575    0    4 5511.60183 5503.88575  0.14%     -    0s
     0     0 5503.88597    0    4 5511.60183 5503.88597  0.14%     -    0s
     0     0 5503.89198    0    4 5511.60183 5503.89198  0.14%     -    0s
     0     0 5503.89198    0    4 5511.60183 5503.89198  0.14%     -    0s
     0     2 5503.89633    0    4 5511.60183 5503.89633  0.14%     -    0s
*   10     5               9    5504.8887283 5503.91710  0.02%   4.8    0s
*   12     4              10    5504.8642064 5503.91710  0.02%   4.2    0s
*   19     3               6    5503.9234267 5503.92092  0.00%   3.6    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 4

Explored 20 nodes (208 simplex iterations) in 0.58 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.503923426738e+03, best bound 5.503920919737e+03, gap 0.0000%