Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:02:48 2013

Optimize a model with 60 rows, 462 columns and 4136 nonzeros
Presolve removed 22 rows and 26 columns
Presolve time: 0.01s
Presolved: 38 rows, 436 columns, 3686 nonzeros
Variable types: 420 continuous, 16 integer (16 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 4442.90283    0    3          - 4442.90283     -      -    0s
     0     0 4446.78799    0    3          - 4446.78799     -      -    0s
     0     0 4458.12135    0    3          - 4458.12135     -      -    0s
     0     0 4458.56370    0    3          - 4458.56370     -      -    0s
     0     0 4458.56370    0    3          - 4458.56370     -      -    0s
H    0     0                    4467.1898909 4458.56370  0.19%     -    0s
     0     0 4458.56370    0    2 4467.18989 4458.56370  0.19%     -    0s
     0     0 4458.59278    0    4 4467.18989 4458.59278  0.19%     -    0s
     0     0 4458.59278    0    4 4467.18989 4458.59278  0.19%     -    0s
     0     0 4458.64509    0    4 4467.18989 4458.64509  0.19%     -    0s
     0     0 4458.66321    0    5 4467.18989 4458.66321  0.19%     -    0s
     0     0 4458.66321    0    5 4467.18989 4458.66321  0.19%     -    0s
H    0     0                    4458.9448858 4458.66321  0.01%     -    0s

Cutting planes:
  Gomory: 1
  Flow cover: 5

Explored 0 nodes (89 simplex iterations) in 0.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458944885800e+03, best bound 4.458663210422e+03, gap 0.0063%