Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:02:44 2013

Optimize a model with 60 rows, 1084 columns and 8914 nonzeros
Presolve removed 22 rows and 248 columns
Presolve time: 0.03s
Presolved: 38 rows, 836 columns, 8070 nonzeros
Variable types: 820 continuous, 16 integer (16 binary)

Root relaxation: objective 3.881594e+03, 17 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    5          - 3881.59364     -      -    0s
     0     0 3881.86365    0    5          - 3881.86365     -      -    0s
     0     0 3883.18126    0    5          - 3883.18126     -      -    0s
     0     0 3883.23165    0    5          - 3883.23165     -      -    0s
     0     0 3883.23360    0    5          - 3883.23360     -      -    0s
     0     0 3884.42743    0    5          - 3884.42743     -      -    0s
     0     0 3892.62519    0    4          - 3892.62519     -      -    0s
     0     0 3892.62519    0    4          - 3892.62519     -      -    0s
H    0     0                    3897.5627652 3892.62519  0.13%     -    0s
H    0     0                    3897.0960035 3892.62519  0.11%     -    0s
     0     0 3893.87054    0    3 3897.09600 3893.87054  0.08%     -    0s
     0     0 3893.89546    0    2 3897.09600 3893.89546  0.08%     -    0s
     0     0 3893.89553    0    2 3897.09600 3893.89553  0.08%     -    0s
     0     0 3893.89553    0    2 3897.09600 3893.89553  0.08%     -    0s
     0     2 3893.89980    0    2 3897.09600 3893.89980  0.08%     -    0s
*    1     1               1    3893.8998644 3893.89986   0.0%   4.0    0s

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

Explored 2 nodes (123 simplex iterations) in 0.17 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893899864364e+03, best bound 3.893899864364e+03, gap 0.0%