Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:44 2012

Optimize a model with 555 rows, 540 columns and 1774 nonzeros
Presolve removed 58 rows and 34 columns
Presolve time: 0.01s
Presolved: 497 rows, 506 columns, 1665 nonzeros
Variable types: 336 continuous, 170 integer (170 binary)

Root relaxation: objective 4.927956e+04, 253 iterations, 0.00 seconds

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

     0     0 49279.5627    0   89          - 49279.5627     -      -    0s
H    0     0                    90443.000000 49279.5627  45.5%     -    0s
     0     0 60774.7890    0   25 90443.0000 60774.7890  32.8%     -    0s
     0     0 61257.3965    0   26 90443.0000 61257.3965  32.3%     -    0s
     0     0 61408.7203    0   22 90443.0000 61408.7203  32.1%     -    0s
     0     0 61477.5462    0   19 90443.0000 61477.5462  32.0%     -    0s
     0     0 61489.4892    0   17 90443.0000 61489.4892  32.0%     -    0s
     0     0 61489.4892    0   16 90443.0000 61489.4892  32.0%     -    0s
     0     2 61490.8614    0   16 90443.0000 61490.8614  32.0%     -    0s
H   27    26                    62042.000000 61490.8614  0.89%   5.3    0s
H   54    47                    61921.000000 61490.8614  0.69%   4.8    0s
H  165    89                    61778.000000 61506.4501  0.44%   5.9    1s
   462   225 61585.1166    7   12 61778.0000 61539.2812  0.39%   6.3    5s
H  517   197                    61712.000000 61541.2073  0.28%   6.4    5s
H  607   205                    61684.000000 61551.4023  0.21%   6.3    6s

Cutting planes:
  Gomory: 4
  Cover: 3
  Flow cover: 12
  Flow path: 6

Explored 829 nodes (5851 simplex iterations) in 9.57 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.168399999997e+04, best bound 6.167812202102e+04, gap 0.0095%