Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:53:54 2013

Optimize a model with 640 rows, 14240 columns and 118620 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.19s
Presolved: 620 rows, 14220 columns, 108600 nonzeros
Variable types: 14040 continuous, 180 integer (180 binary)

Root relaxation: objective 3.894400e+04, 469 iterations, 0.02 seconds

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

     0     0 38944.0027    0    6          - 38944.0027     -      -    0s
     0     0 38945.2579    0    6          - 38945.2579     -      -    0s
     0     0 38945.7576    0    9          - 38945.7576     -      -    0s
     0     0 38945.7576    0    9          - 38945.7576     -      -    0s
     0     0 38945.7576    0    9          - 38945.7576     -      -    0s
     0     2 38947.0062    0    9          - 38947.0062     -      -    1s
*   31    21              30    39374.358293 39008.4820  0.93%   9.9    1s
*   57    19              26    39248.182294 39019.8283  0.58%   7.4    2s
H   88    15                    39247.990742 39224.7465  0.06%   7.9    2s
*   97    18              26    39247.715281 39224.7465  0.06%   7.4    2s
H  115     7                    39247.244654 39228.6310  0.05%   6.6    2s

Cutting planes:
  Flow cover: 6

Explored 145 nodes (1464 simplex iterations) in 2.29 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924724465439e+04, best bound 3.924568148015e+04, gap 0.0040%