Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:02:50 2013

Optimize a model with 60 rows, 462 columns and 4136 nonzeros
Presolve removed 22 rows and 24 columns
Presolve time: 0.01s
Presolved: 38 rows, 438 columns, 3690 nonzeros
Variable types: 422 continuous, 16 integer (16 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 3883.18126    0    3          - 3883.18126     -      -    0s
     0     0 3883.23360    0    3          - 3883.23360     -      -    0s
     0     0 3884.42743    0    3          - 3884.42743     -      -    0s
     0     0 3884.42743    0    3          - 3884.42743     -      -    0s
H    0     0                    3898.0707552 3884.42743  0.35%     -    0s
     0     0 3893.30589    0    3 3898.07076 3893.30589  0.12%     -    0s
     0     0 3893.33608    0    4 3898.07076 3893.33608  0.12%     -    0s
     0     0 3893.87119    0    1 3898.07076 3893.87119  0.11%     -    0s
     0     0 3893.87119    0    1 3898.07076 3893.87119  0.11%     -    0s
H    0     0                    3893.8998644 3893.87119  0.00%     -    0s

Cutting planes:
  Flow cover: 1

Explored 0 nodes (77 simplex iterations) in 0.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.893899864364e+03, best bound 3.893871190665e+03, gap 0.0007%