Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:38 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 1.791602e+04, 134 iterations, 0.00 seconds

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

     0     0 17916.0191    0    3          - 17916.0191     -      -    0s
     0     0 17920.4023    0    4          - 17920.4023     -      -    0s
     0     0 17920.6651    0    4          - 17920.6651     -      -    0s
     0     0 17920.6651    0    4          - 17920.6651     -      -    0s
H    0     0                    18584.802087 17920.6651  3.57%     -    0s
     0     2 17923.3868    0    4 18584.8021 17923.3868  3.56%     -    0s
H   27    27                    18013.670902 17965.9460  0.26%   2.0    0s
H   55    27                    17997.948409 17966.0881  0.18%   2.3    0s
H  111    44                    17990.921905 17968.9128  0.12%   2.6    0s
*  126    47              18    17990.325878 17970.8936  0.11%   2.7    0s
*  131    45              17    17989.940074 17971.1005  0.10%   2.7    0s
*  149    52               5    17988.370527 17972.3575  0.09%   2.8    0s
*  163    43               8    17987.076412 17973.5531  0.08%   2.8    0s
*  215    21              15    17984.425761 17980.9490  0.02%   2.9    0s
*  216    18              15    17984.200283 17980.9490  0.02%   2.8    0s

Cutting planes:
  Gomory: 3
  Flow cover: 4

Explored 223 nodes (972 simplex iterations) in 0.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.798420028333e+04, best bound 1.798290253720e+04, gap 0.0072%