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

Optimize a model with 640 rows, 2520 columns and 6010 nonzeros
Presolve removed 20 rows and 30 columns
Presolve time: 0.03s
Presolved: 620 rows, 2490 columns, 4980 nonzeros
Variable types: 2000 continuous, 490 integer (490 binary)

Root relaxation: objective 2.162324e+04, 143 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    2          - 21623.2446     -      -    0s
     0     0 21628.6225    0    4          - 21628.6225     -      -    0s
     0     0 21628.8403    0    4          - 21628.8403     -      -    0s
     0     0 21628.8403    0    4          - 21628.8403     -      -    0s
H    0     0                    22502.287750 21628.8403  3.88%     -    0s
     0     2 21639.1793    0    4 22502.2878 21639.1793  3.84%     -    0s
*   26    25              21    21785.096796 21660.8284  0.57%   3.2    0s
*   28    22              20    21782.382721 21660.8284  0.56%   3.0    0s
*   53    28              23    21778.161874 21677.3740  0.46%   2.6    0s
*   75    27              22    21763.805895 21683.1217  0.37%   2.7    0s
H  110    31                    21759.795473 21709.5869  0.23%   3.7    0s
*  155    35              12    21759.374832 21719.0960  0.19%   3.6    0s
*  298    19              23    21759.185397 21755.0653  0.02%   3.2    0s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 321 nodes (1355 simplex iterations) in 0.31 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.175918539669e+04, best bound 2.175707332306e+04, gap 0.0097%