Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:51:53 2013

Optimize a model with 640 rows, 24700 columns and 248380 nonzeros
Presolve removed 20 rows and 500 columns
Presolve time: 0.55s
Presolved: 620 rows, 24200 columns, 228380 nonzeros
Variable types: 24020 continuous, 180 integer (180 binary)

Root relaxation: objective 4.013975e+04, 527 iterations, 0.03 seconds

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

     0     0 40139.7487    0   14          - 40139.7487     -      -    0s
     0     0 40139.7487    0   14          - 40139.7487     -      -    1s
     0     0 40139.7487    0   14          - 40139.7487     -      -    1s
     0     0 40139.7708    0   14          - 40139.7708     -      -    1s
     0     0 40139.7708    0   14          - 40139.7708     -      -    1s
     0     2 40141.6354    0   14          - 40141.6354     -      -    4s
    38    40 40203.8943   27   13          - 40143.1089     -    7.6    5s
*  171   165             154    40976.370531 40143.1089  2.03%   3.5    5s
H  173   162                    40812.686433 40143.1089  1.64%   3.5    5s
*  174   162             153    40788.160787 40143.1089  1.58%   3.5    5s
*  184   161             155    40695.549164 40143.1089  1.36%   3.5    6s
*  210    26              21    40195.498552 40144.1232  0.13%   3.5    6s
H  227    25                    40195.260475 40145.8292  0.12%   3.5    6s

Cutting planes:
  Flow cover: 4

Explored 332 nodes (2480 simplex iterations) in 7.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.019526047462e+04, best bound 4.019142083981e+04, gap 0.0096%