Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:02:49 2013

Optimize a model with 60 rows, 462 columns and 4136 nonzeros
Presolve removed 22 rows and 24 columns
Presolve time: 0.01s
Presolved: 38 rows, 438 columns, 3690 nonzeros
Variable types: 422 continuous, 16 integer (16 binary)

Root relaxation: objective 4.810927e+03, 16 iterations, 0.00 seconds

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

     0     0 4810.92679    0    6          - 4810.92679     -      -    0s
     0     0 4813.55088    0    6          - 4813.55088     -      -    0s
     0     0 4830.14900    0    6          - 4830.14900     -      -    0s
     0     0 4830.63064    0    6          - 4830.63064     -      -    0s
     0     0 4830.63064    0    4          - 4830.63064     -      -    0s
     0     0 4830.66027    0    8          - 4830.66027     -      -    0s
     0     0 4830.70271    0    8          - 4830.70271     -      -    0s
     0     0 4830.70271    0    8          - 4830.70271     -      -    0s
     0     2 4830.74612    0    8          - 4830.74612     -      -    0s
*    9     6               9    4831.3369111 4830.74612  0.01%   3.0    0s

Cutting planes:
  Gomory: 3
  Implied bound: 2
  Flow cover: 4

Explored 12 nodes (137 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.831336911133e+03, best bound 4.831079447699e+03, gap 0.0053%