Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:46 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 2.162324e+04, 163 iterations, 0.00 seconds

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

     0     0 21623.2446    0    4          - 21623.2446     -      -    0s
     0     0 21662.9819    0    4          - 21662.9819     -      -    0s
     0     0 21670.0322    0    5          - 21670.0322     -      -    0s
     0     0 21672.3284    0    4          - 21672.3284     -      -    0s
     0     0 21674.8620    0    4          - 21674.8620     -      -    0s
     0     0 21675.3239    0    6          - 21675.3239     -      -    0s
     0     0 21677.0085    0    6          - 21677.0085     -      -    0s
     0     0 21677.1355    0    6          - 21677.1355     -      -    0s
     0     0 21677.3060    0    6          - 21677.3060     -      -    0s
     0     0 21677.3060    0    6          - 21677.3060     -      -    0s
H    0     0                    22736.132680 21677.3060  4.66%     -    0s
     0     2 21677.3060    0    6 22736.1327 21677.3060  4.66%     -    0s
*    2     2               1    22011.316113 21703.4591  1.40%  31.0    0s
*   39     7              28    21759.625285 21755.5155  0.02%   8.3    0s
*   40     2              28    21759.374832 21755.5155  0.02%   8.1    0s

Cutting planes:
  Gomory: 2
  Implied bound: 15
  Flow cover: 5

Explored 45 nodes (651 simplex iterations) in 0.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.175937483245e+04, best bound 2.175806131342e+04, gap 0.0060%