Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:39 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 1.997658e+04, 106 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    2          - 19976.5790     -      -    0s
     0     0 19982.6997    0    4          - 19982.6997     -      -    0s
     0     0 19984.1539    0    4          - 19984.1539     -      -    0s
     0     0 19984.1539    0    4          - 19984.1539     -      -    0s
H    0     0                    20844.905762 19984.1539  4.13%     -    0s
     0     2 19986.4741    0    4 20844.9058 19986.4741  4.12%     -    0s
*   49    40              43    20544.347173 20093.1083  2.20%   3.2    0s
H   54    15                    20237.680152 20095.2884  0.70%   3.2    0s
*   76    15              24    20163.083084 20095.2884  0.34%   2.9    0s
*  150    17               4    20158.958557 20136.4463  0.11%   2.8    0s
*  180    15              14    20158.515969 20149.3723  0.05%   2.8    0s
*  185     9              12    20158.428444 20154.0321  0.02%   2.8    0s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 189 nodes (737 simplex iterations) in 0.27 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.015842844375e+04, best bound 2.015666806754e+04, gap 0.0087%