Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:18 2013

Optimize a model with 56 rows, 570 columns and 4110 nonzeros
Presolve removed 22 rows and 138 columns
Presolve time: 0.01s
Presolved: 34 rows, 432 columns, 3662 nonzeros
Variable types: 418 continuous, 14 integer (14 binary)

Root relaxation: objective 4.440467e+03, 14 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    4          - 4440.46714     -      -    0s
H    0     0                    4460.1195954 4440.46714  0.44%     -    0s
     0     0 4443.85913    0    4 4460.11960 4443.85913  0.36%     -    0s
     0     0 4446.78799    0    4 4460.11960 4446.78799  0.30%     -    0s
     0     0 4457.09998    0    3 4460.11960 4457.09998  0.07%     -    0s
     0     0 4457.09998    0    3 4460.11960 4457.09998  0.07%     -    0s
     0     0 4457.09998    0    3 4460.11960 4457.09998  0.07%     -    0s
     0     0 4457.16626    0    6 4460.11960 4457.16626  0.07%     -    0s
     0     2 4458.74879    0    6 4460.11960 4458.74879  0.03%     -    0s
*   11     7              16    4458.9422153 4458.94222   0.0%   6.9    0s

Cutting planes:
  Gomory: 2
  Implied bound: 1
  Flow cover: 1

Explored 12 nodes (187 simplex iterations) in 0.07 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458942215307e+03, best bound 4.458942215307e+03, gap 0.0%