Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:32:38 2012

Optimize a model with 555 rows, 540 columns and 1780 nonzeros
Presolve removed 40 rows and 24 columns
Presolve time: 0.00s
Presolved: 515 rows, 516 columns, 1684 nonzeros
Variable types: 344 continuous, 172 integer (172 binary)

Root relaxation: objective 4.833708e+04, 274 iterations, 0.00 seconds

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

     0     0 48337.0786    0   94          - 48337.0786     -      -    0s
     0     0 59758.5418    0   33          - 59758.5418     -      -    0s
     0     0 60267.7002    0   28          - 60267.7002     -      -    0s
     0     0 60417.3388    0   20          - 60417.3388     -      -    0s
     0     0 60437.4533    0   17          - 60437.4533     -      -    0s
     0     0 60439.8273    0   20          - 60439.8273     -      -    0s
     0     2 60443.3568    0   20          - 60443.3568     -      -    0s
*   41    36              37    61249.000000 60443.3568  1.32%   4.7    0s
H   70    49                    60881.000000 60458.1132  0.69%   5.6    0s
H   97    58                    60851.000000 60471.3309  0.62%   5.7    1s
   464   175     cutoff   20      60851.0000 60590.2356  0.43%   5.8    5s
H  515   191                    60839.000000 60605.5578  0.38%   5.7    5s
H  596   104                    60734.000000 60617.2457  0.19%   5.6    6s

Cutting planes:
  Gomory: 24
  Cover: 2
  Implied bound: 1
  Flow cover: 77
  Flow path: 52

Explored 939 nodes (5482 simplex iterations) in 9.92 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.073400000000e+04, best bound 6.072872150310e+04, gap 0.0087%