Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:26:24 2013

Optimize a model with 2028 rows, 2044 columns and 8082 nonzeros
Presolve removed 1902 rows and 1902 columns
Presolve time: 0.07s
Presolved: 126 rows, 142 columns, 404 nonzeros
Variable types: 82 continuous, 60 integer (60 binary)

Root relaxation: objective 3.881594e+03, 63 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                    3893.9001087 3881.59364  0.32%     -    0s
     0     0 3881.86365    0    1 3893.90011 3881.86365  0.31%     -    0s
     0     0 3893.89627    0    2 3893.90011 3893.89627  0.00%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 3

Explored 0 nodes (84 simplex iterations) in 0.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893900108683e+03, best bound 3.893896268835e+03, gap 0.0001%