Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:41:44 2013

Optimize a model with 520 rows, 6720 columns and 26260 nonzeros
Presolve removed 20 rows and 580 columns
Presolve time: 0.03s
Presolved: 500 rows, 6140 columns, 24260 nonzeros
Variable types: 6020 continuous, 120 integer (120 binary)

Root relaxation: objective 3.894400e+04, 541 iterations, 0.01 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 38956.6277    0    6          - 38956.6277     -      -    0s
     0     0 38959.4501    0    9          - 38959.4501     -      -    0s
     0     0 38960.4147    0    9          - 38960.4147     -      -    0s
     0     0 38960.4147    0    9          - 38960.4147     -      -    0s
     0     0 38960.4147    0    9          - 38960.4147     -      -    0s
H    0     0                    43210.881067 38960.4147  9.84%     -    0s
     0     2 38977.6370    0    9 43210.8811 38977.6370  9.80%     -    0s
*   26    16              24    39481.138785 39233.7542  0.63%   9.3    0s
H   30     4                    39273.182487 39233.7542  0.10%   8.1    0s
*   36     6              12    39263.732490 39237.9280  0.07%   7.5    0s
*   37     5              12    39263.607260 39237.9280  0.07%   7.4    0s
*   53     3              10    39247.120171 39245.0649  0.01%   5.8    0s

Cutting planes:
  Flow cover: 7

Explored 54 nodes (1049 simplex iterations) in 0.46 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924712017140e+04, best bound 3.924506493500e+04, gap 0.0052%