Gurobi 5.0.1 (linux64) logging started Sun Dec  9 06:11:03 2012

Optimize a model with 570 rows, 540 columns and 1789 nonzeros
Presolve removed 28 rows and 17 columns
Presolve time: 0.01s
Presolved: 542 rows, 523 columns, 1723 nonzeros
Variable types: 349 continuous, 174 integer (174 binary)

Root relaxation: objective 5.100202e+04, 267 iterations, 0.00 seconds

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

     0     0 51002.0245    0   87          - 51002.0245     -      -    0s
H    0     0                    77326.000000 51002.0245  34.0%     -    0s
     0     0 60288.4237    0   21 77326.0000 60288.4237  22.0%     -    0s
H    0     0                    65279.000000 60288.4237  7.64%     -    0s
     0     0 60542.1212    0   13 65279.0000 60542.1212  7.26%     -    0s
     0     0 60666.5204    0   21 65279.0000 60666.5204  7.07%     -    0s
     0     0 60668.6536    0   17 65279.0000 60668.6536  7.06%     -    0s
     0     0 60669.6182    0   15 65279.0000 60669.6182  7.06%     -    0s
     0     0 60682.6825    0   16 65279.0000 60682.6825  7.04%     -    0s
     0     2 60689.5537    0   16 65279.0000 60689.5537  7.03%     -    0s
H   27    22                    60945.000000 60702.2437  0.40%   3.2    0s
*   88    48              16    60942.000000 60734.8456  0.34%   3.4    1s
*  152    66              19    60923.000000 60762.1443  0.26%   3.1    2s
*  167    23               5    60840.000000 60767.7095  0.12%   3.1    2s
   310     3     cutoff    6      60840.0000 60832.9857  0.01%   2.9    5s

Cutting planes:
  Gomory: 25
  Cover: 4
  Implied bound: 1
  Flow cover: 57
  Flow path: 50

Explored 313 nodes (1327 simplex iterations) in 5.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.084000000000e+04, best bound 6.083571157498e+04, gap 0.0070%