Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:26:22 2013

Optimize a model with 2028 rows, 2044 columns and 8082 nonzeros
Presolve removed 1908 rows and 1910 columns
Presolve time: 0.07s
Presolved: 120 rows, 134 columns, 382 nonzeros
Variable types: 77 continuous, 57 integer (57 binary)

Root relaxation: objective 4.440467e+03, 60 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    1          - 4440.46714     -      -    0s
H    0     0                    4458.9448988 4440.46714  0.41%     -    0s
     0     0 4446.78799    0    1 4458.94490 4446.78799  0.27%     -    0s
     0     0 4458.93901    0    2 4458.94490 4458.93901  0.00%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 3

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 4.458944898839e+03, best bound 4.458939014760e+03, gap 0.0001%