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

Optimize a model with 228 rows, 644 columns and 1682 nonzeros
Presolve removed 209 rows and 583 columns
Presolve time: 0.01s
Presolved: 19 rows, 61 columns, 122 nonzeros
Variable types: 48 continuous, 13 integer (13 binary)

Root relaxation: objective 3.881594e+03, 6 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 3881.59364    0    1          - 3881.59364     -      -    0s
H    0     0                    3893.8994555 3881.59364  0.32%     -    0s
     0     0 3881.86365    0    1 3893.89946 3881.86365  0.31%     -    0s
     0     0 3893.87076    0    2 3893.89946 3893.87076  0.00%     -    0s

Cutting planes:
  Cover: 2
  Flow cover: 3

Explored 0 nodes (21 simplex iterations) in 0.01 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893899455475e+03, best bound 3.893870759407e+03, gap 0.0007%