Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:46:21 2013

Optimize a model with 56 rows, 260 columns and 1930 nonzeros
Presolve removed 22 rows and 24 columns
Presolve time: 0.00s
Presolved: 34 rows, 236 columns, 1684 nonzeros
Variable types: 222 continuous, 14 integer (14 binary)

Root relaxation: objective 3.881594e+03, 15 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    3          - 3881.59364     -      -    0s
     0     0 3881.86365    0    3          - 3881.86365     -      -    0s
     0     0 3883.77875    0    3          - 3883.77875     -      -    0s
     0     0 3883.87749    0    4          - 3883.87749     -      -    0s
     0     0 3885.39129    0    3          - 3885.39129     -      -    0s
     0     0 3892.63128    0    3          - 3892.63128     -      -    0s
     0     0 3893.87076    0    1          - 3893.87076     -      -    0s
H    0     0                    3893.8994555 3893.87076  0.00%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 1

Explored 0 nodes (59 simplex iterations) in 0.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893899455474e+03, best bound 3.893870759406e+03, gap 0.0007%