Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:51:34 2013

Optimize a model with 640 rows, 24700 columns and 248380 nonzeros
Presolve removed 20 rows and 500 columns
Presolve time: 0.56s
Presolved: 620 rows, 24200 columns, 228380 nonzeros
Variable types: 24020 continuous, 180 integer (180 binary)

Root relaxation: objective 3.860476e+04, 582 iterations, 0.03 seconds

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

     0     0 38604.7615    0   21          - 38604.7615     -      -    0s
     0     0 38606.1471    0   21          - 38606.1471     -      -    0s
     0     0 38606.1471    0   21          - 38606.1471     -      -    1s
     0     0 38606.1471    0   21          - 38606.1471     -      -    1s
H    0     0                    44135.166427 38606.1471  12.5%     -    2s
     0     2 38606.1471    0   21 44135.1664 38606.1471  12.5%     -    2s
H   27    23                    39137.492056 38838.4290  0.76%  15.0    3s
*   42    36              40    39013.534087 38838.4290  0.45%  10.0    3s
*  115    65              44    38935.556014 38860.3869  0.19%   6.0    3s
*  130    13              21    38867.569656 38860.3961  0.02%   5.6    3s
*  147     6              14    38861.069221 38860.8341  0.00%   5.3    3s

Cutting planes:
  Flow cover: 4

Explored 148 nodes (1824 simplex iterations) in 3.74 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886106922148e+04, best bound 3.886083406204e+04, gap 0.0006%