Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:33:08 2012

Optimize a model with 1635 rows, 1620 columns and 5901 nonzeros
Presolve removed 211 rows and 68 columns
Presolve time: 0.01s
Presolved: 1424 rows, 1552 columns, 5481 nonzeros
Variable types: 1382 continuous, 170 integer (170 binary)

Root relaxation: objective 6.130115e+04, 277 iterations, 0.00 seconds

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

     0     0 61301.1472    0   17          - 61301.1472     -      -    0s
H    0     0                    63430.000000 61301.1472  3.36%     -    0s
H    0     0                    63148.000000 61301.1472  2.92%     -    0s
     0     0 61450.5279    0   23 63148.0000 61450.5279  2.69%     -    0s
     0     0 61454.4239    0   25 63148.0000 61454.4239  2.68%     -    0s
     0     0 61468.4839    0   26 63148.0000 61468.4839  2.66%     -    0s
     0     0 61468.9893    0   26 63148.0000 61468.9893  2.66%     -    0s
H    0     0                    61684.000000 61468.9893  0.35%     -    0s
     0     0 61468.9893    0   17 61684.0000 61468.9893  0.35%     -    0s
     0     0 61498.5597    0   19 61684.0000 61498.5597  0.30%     -    0s
     0     0 61506.5674    0   21 61684.0000 61506.5674  0.29%     -    0s
     0     2 61511.0579    0   21 61684.0000 61511.0579  0.28%     -    0s

Cutting planes:
  Gomory: 5
  Cover: 1
  Implied bound: 1
  Clique: 2
  Flow cover: 7

Explored 243 nodes (1365 simplex iterations) in 0.27 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.168400000000e+04, best bound 6.167815494891e+04, gap 0.0095%