Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:08:16 2013

Optimize a model with 2032 rows, 4046 columns and 14090 nonzeros
Presolve removed 23 rows and 165 columns
Presolve time: 0.17s
Presolved: 2009 rows, 3881 columns, 11624 nonzeros
Variable types: 2019 continuous, 1862 integer (1862 binary)

Root relaxation: objective 4.447599e+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 4447.59859    0    2          - 4447.59859     -      -    0s
     0     0 4448.27931    0    3          - 4448.27931     -      -    0s
     0     0 4450.59302    0    2          - 4450.59302     -      -    0s
     0     0 4450.70686    0    2          - 4450.70686     -      -    0s
     0     0 4450.78465    0    2          - 4450.78465     -      -    0s
     0     0 4450.81031    0    2          - 4450.81031     -      -    0s
     0     0 4450.83582    0    2          - 4450.83582     -      -    0s
H    0     0                    4458.9449856 4450.83582  0.18%     -    0s
     0     2 4450.83582    0    2 4458.94499 4450.83582  0.18%     -    1s

Cutting planes:
  Gomory: 1
  Cover: 3
  Flow cover: 2

Explored 89 nodes (802 simplex iterations) in 1.58 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458944985629e+03, best bound 4.458630673505e+03, gap 0.0070%