Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:26:28 2013

Optimize a model with 64 rows, 2110 columns and 24118 nonzeros
Presolve removed 22 rows and 74 columns
Presolve time: 0.10s
Presolved: 42 rows, 2036 columns, 22070 nonzeros
Variable types: 2018 continuous, 18 integer (18 binary)

Root relaxation: objective 4.440467e+03, 20 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    7          - 4440.46714     -      -    0s
     0     0 4442.02841    0    7          - 4442.02841     -      -    0s
     0     0 4442.02841    0    7          - 4442.02841     -      -    0s
H    0     0                    4461.5795111 4442.02841  0.44%     -    0s
     0     0 4446.78799    0    7 4461.57951 4446.78799  0.33%     -    0s
     0     0 4448.66764    0    7 4461.57951 4448.66764  0.29%     -    0s
     0     0 4458.64603    0    4 4461.57951 4458.64603  0.07%     -    0s
     0     0 4458.64603    0    4 4461.57951 4458.64603  0.07%     -    0s
     0     2 4458.64603    0    4 4461.57951 4458.64603  0.07%     -    0s
*    6     2               5    4458.9448988 4458.94472  0.00%   6.2    0s

Cutting planes:
  Implied bound: 2
  Flow cover: 3

Explored 7 nodes (186 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 4.458944724985e+03, gap 0.0000%