Gurobi 5.0.1 (linux64) logging started Sun Dec  9 06:10:55 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                    77126.000000 51002.0245  33.9%     -    0s
     0     0 60288.4237    0   21 77126.0000 60288.4237  21.8%     -    0s
     0     0 60542.1212    0   13 77126.0000 60542.1212  21.5%     -    0s
     0     0 60666.5204    0   21 77126.0000 60666.5204  21.3%     -    0s
     0     0 60668.6536    0   17 77126.0000 60668.6536  21.3%     -    0s
     0     0 60669.6182    0   15 77126.0000 60669.6182  21.3%     -    0s
     0     0 60682.6825    0   16 77126.0000 60682.6825  21.3%     -    0s
H    0     0                    62246.000000 60682.6825  2.51%     -    0s
     0     2 60689.5537    0   16 62246.0000 60689.5537  2.50%     -    0s
H   20    19                    61358.000000 60702.2437  1.07%   2.0    0s
*   24    19              22    60978.000000 60702.2437  0.45%   2.0    0s
*   77    28              19    60843.000000 60712.1578  0.22%   2.1    0s
*  164    35               6    60840.000000 60786.5142  0.09%   2.8    0s

Cutting planes:
  Gomory: 22
  Cover: 5
  Implied bound: 2
  Flow cover: 53
  Flow path: 47

Explored 251 nodes (1099 simplex iterations) in 0.12 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.084000000000e+04, best bound 6.083416383171e+04, gap 0.0096%