Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:16:15 2013

Optimize a model with 440 rows, 4340 columns and 9520 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.01s
Presolved: 420 rows, 4320 columns, 9300 nonzeros
Variable types: 4240 continuous, 80 integer (80 binary)

Root relaxation: objective 3.860476e+04, 512 iterations, 0.01 seconds

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

     0     0 38604.7615    0    9          - 38604.7615     -      -    0s
     0     0 38647.7990    0    9          - 38647.7990     -      -    0s
     0     0 38659.1670    0    9          - 38659.1670     -      -    0s
     0     0 38661.9032    0    9          - 38661.9032     -      -    0s
     0     0 38662.7254    0    9          - 38662.7254     -      -    0s
     0     0 38662.8061    0    9          - 38662.8061     -      -    0s
     0     0 38663.1598    0    9          - 38663.1598     -      -    0s
     0     0 38663.7987    0    9          - 38663.7987     -      -    0s
     0     0 38664.7165    0    9          - 38664.7165     -      -    0s
     0     0 38664.9310    0    9          - 38664.9310     -      -    0s
     0     0 38664.9310    0    9          - 38664.9310     -      -    0s
H    0     0                    39822.233282 38664.9310  2.91%     -    0s
     0     2 38664.9310    0    9 39822.2333 38664.9310  2.91%     -    0s
*    6     4               6    38860.606169 38804.1026  0.15%  27.3    0s

Cutting planes:
  Flow cover: 10

Explored 12 nodes (1028 simplex iterations) in 0.18 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886060616871e+04, best bound 3.885923656309e+04, gap 0.0035%