Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:41 2012

Optimize a model with 555 rows, 540 columns and 1776 nonzeros
Presolve removed 101 rows and 78 columns
Presolve time: 0.01s
Presolved: 454 rows, 462 columns, 1514 nonzeros
Variable types: 310 continuous, 152 integer (152 binary)

Root relaxation: objective 5.187246e+04, 225 iterations, 0.00 seconds

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

     0     0 51872.4622    0   73          - 51872.4622     -      -    0s
H    0     0                    74833.000000 51872.4622  30.7%     -    0s
     0     0 61220.2876    0   21 74833.0000 61220.2876  18.2%     -    0s
     0     0 61733.5555    0   18 74833.0000 61733.5555  17.5%     -    0s
     0     0 61819.5983    0   13 74833.0000 61819.5983  17.4%     -    0s
     0     0 61824.0094    0   13 74833.0000 61824.0094  17.4%     -    0s
     0     0 61842.6651    0   13 74833.0000 61842.6651  17.4%     -    0s
H    0     0                    73707.000000 61842.6651  16.1%     -    0s
     0     2 61843.1935    0   13 73707.0000 61843.1935  16.1%     -    0s
H   33    29                    63315.000000 61846.8217  2.32%   5.3    0s
*   35    31              27    62838.000000 61846.8217  1.58%   5.3    0s
*  126    68              42    62601.000000 61862.6930  1.18%   4.5    0s
*  222    94              43    62445.000000 61870.4605  0.92%   4.4    0s
H  549   168                    62294.000000 61903.6083  0.63%   4.5    0s
H  700   128                    62133.000000 61925.3741  0.33%   4.6    0s
*  795   114              30    62045.000000 61980.4335  0.10%   4.8    0s

Cutting planes:
  Gomory: 15
  Flow cover: 37
  Flow path: 18

Explored 808 nodes (4181 simplex iterations) in 0.38 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.204500000000e+04, best bound 6.204233468586e+04, gap 0.0043%