Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:45 2013

Optimize a model with 660 rows, 2030 columns and 5550 nonzeros
Presolve removed 10 rows and 10 columns
Presolve time: 0.04s
Presolved: 650 rows, 2020 columns, 5040 nonzeros
Variable types: 1520 continuous, 500 integer (500 binary)

Root relaxation: objective 1.997658e+04, 139 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 19976.5790    0    4          - 19976.5790     -      -    0s
     0     0 20029.9879    0    4          - 20029.9879     -      -    0s
     0     0 20042.1630    0    4          - 20042.1630     -      -    0s
     0     0 20044.0967    0    4          - 20044.0967     -      -    0s
     0     0 20047.5070    0    4          - 20047.5070     -      -    0s
     0     0 20049.4605    0    5          - 20049.4605     -      -    0s
     0     0 20049.6415    0    4          - 20049.6415     -      -    0s
     0     0 20050.1239    0    5          - 20050.1239     -      -    0s
     0     0 20051.3943    0    4          - 20051.3943     -      -    0s
     0     0 20051.3943    0    4          - 20051.3943     -      -    0s
     0     2 20051.3943    0    4          - 20051.3943     -      -    0s
*   23     5              12    20158.428444 20156.1435  0.01%   8.8    0s

Cutting planes:
  Gomory: 2
  Implied bound: 13
  Flow cover: 1

Explored 29 nodes (479 simplex iterations) in 0.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.015842844375e+04, best bound 2.015842844375e+04, gap 0.0%