Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:30 2012

Optimize a model with 555 rows, 540 columns and 1782 nonzeros
Presolve removed 39 rows and 24 columns
Presolve time: 0.01s
Presolved: 516 rows, 516 columns, 1686 nonzeros
Variable types: 345 continuous, 171 integer (171 binary)

Root relaxation: objective 4.999116e+04, 256 iterations, 0.00 seconds

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

     0     0 49991.1551    0   91          - 49991.1551     -      -    0s
H    0     0                    86287.000000 49991.1551  42.1%     -    0s
     0     0 60781.1811    0   16 86287.0000 60781.1811  29.6%     -    0s
     0     0 61195.3295    0   17 86287.0000 61195.3295  29.1%     -    0s
     0     0 61460.9399    0    6 86287.0000 61460.9399  28.8%     -    0s
     0     0 61464.8322    0    6 86287.0000 61464.8322  28.8%     -    0s
H    0     0                    63056.000000 61464.8322  2.52%     -    0s
     0     2 61465.0166    0    6 63056.0000 61465.0166  2.52%     -    0s
H   19    17                    62363.000000 61465.3203  1.44%   4.6    0s
*   24    18              19    62037.000000 61465.3203  0.92%   4.5    0s
*   47    32              17    61986.000000 61484.7270  0.81%   4.9    0s
*   49    30              19    61975.000000 61484.7270  0.79%   4.9    0s
*   51    27              18    61967.000000 61484.7270  0.78%   4.8    0s
H   59    12                    61553.000000 61486.7642  0.11%   4.5    0s
*   68     3               4    61516.000000 61509.8919  0.01%   4.3    0s

Cutting planes:
  Gomory: 13
  Cover: 2
  Flow cover: 58
  Flow path: 42

Explored 69 nodes (687 simplex iterations) in 0.78 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.151600000000e+04, best bound 6.150989187366e+04, gap 0.0099%