Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:03:36 2013

Optimize a model with 4140 rows, 5020 columns and 18010 nonzeros
Presolve removed 30 rows and 20 columns
Presolve time: 0.23s
Presolved: 4110 rows, 5000 columns, 13980 nonzeros
Variable types: 3010 continuous, 1990 integer (1990 binary)

Root relaxation: objective 2.162324e+04, 1499 iterations, 0.03 seconds

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

     0     0 21623.2446    0    2          - 21623.2446     -      -    0s
     0     0 21664.2416    0    5          - 21664.2416     -      -    0s
     0     0 21681.2868    0    3          - 21681.2868     -      -    0s
     0     0 21684.5728    0    6          - 21684.5728     -      -    0s
     0     0 21686.7955    0    3          - 21686.7955     -      -    0s
     0     0 21686.7972    0    4          - 21686.7972     -      -    0s
     0     2 21686.8046    0    4          - 21686.8046     -      -    0s
H   46    46                    21760.720734 21687.1955  0.34%  26.0    1s
*  310   187              18    21760.492688 21712.3475  0.22%   7.8    1s
*  312   183              19    21759.984974 21712.3475  0.22%   7.8    1s
*  314   182              20    21759.468587 21712.3475  0.22%   7.9    1s
*  316   182              21    21759.206022 21712.3475  0.22%   8.0    1s

Cutting planes:
  Gomory: 3
  Flow cover: 9

Explored 1893 nodes (14541 simplex iterations) in 2.97 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.175920602203e+04, best bound 2.175705377076e+04, gap 0.0099%