Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:26:27 2013

Optimize a model with 1028 rows, 3044 columns and 8082 nonzeros
Presolve removed 954 rows and 2818 columns
Presolve time: 0.09s
Presolved: 74 rows, 226 columns, 452 nonzeros
Variable types: 158 continuous, 68 integer (68 binary)

Root relaxation: objective 3.881594e+03, 5 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
     0     0 3881.86365    0    1          - 3881.86365     -      -    0s
     0     0 3893.87059    0    2          - 3893.87059     -      -    0s
     0     0 3893.87065    0    2          - 3893.87065     -      -    0s
     0     0 3893.87703    0    2          - 3893.87703     -      -    0s
     0     0 3893.88346    0    2          - 3893.88346     -      -    0s
     0     0 3893.88988    0    2          - 3893.88988     -      -    0s
     0     0 3893.89628    0    2          - 3893.89628     -      -    0s
H    0     0                    3893.9001087 3893.89628  0.00%     -    0s

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

Explored 0 nodes (81 simplex iterations) in 0.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893900108685e+03, best bound 3.893896276131e+03, gap 0.0001%