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 1.836170e+04, 122 iterations, 0.00 seconds

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

     0     0 18361.7044    0    1          - 18361.7044     -      -    0s
     0     0 18364.0264    0    2          - 18364.0264     -      -    0s
     0     0 18364.0264    0    2          - 18364.0264     -      -    0s
H    0     0                    18466.379364 18364.0264  0.55%     -    0s
     0     2 18370.2259    0    2 18466.3794 18370.2259  0.52%     -    0s
*    8     7               5    18425.852468 18383.6858  0.23%   5.5    0s
*   10     6               5    18425.474532 18383.6858  0.23%   5.3    0s
*   32    14              11    18420.417737 18397.0811  0.13%   3.7    0s
*   44    17               8    18419.996616 18399.1874  0.11%   3.4    0s
*   49    15               8    18419.206591 18399.9379  0.10%   3.4    0s
*   55    12               9    18419.171318 18402.5004  0.09%   3.5    0s
*   63     9               8    18418.241613 18409.2450  0.05%   3.5    0s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 86 nodes (555 simplex iterations) in 0.15 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.841824161337e+04, best bound 1.841746637141e+04, gap 0.0042%