Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:08:49 2013

Optimize a model with 68 rows, 2066 columns and 24148 nonzeros
Presolve removed 22 rows and 24 columns
Presolve time: 0.07s
Presolved: 46 rows, 2042 columns, 22102 nonzeros
Variable types: 2022 continuous, 20 integer (20 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 4812.12387    0    6          - 4812.12387     -      -    0s
     0     0 4827.90727    0    6          - 4827.90727     -      -    0s
     0     0 4829.25324    0    6          - 4829.25324     -      -    0s
     0     0 4829.77118    0    6          - 4829.77118     -      -    0s
     0     0 4829.77118    0    6          - 4829.77118     -      -    0s
H    0     0                    4831.2743814 4829.77118  0.03%     -    0s
     0     0 4830.45615    0    6 4831.27438 4830.45615  0.02%     -    0s
     0     0 4830.46305    0    6 4831.27438 4830.46305  0.02%     -    0s
     0     0 4830.46367    0    7 4831.27438 4830.46367  0.02%     -    0s
     0     0 4830.46367    0    7 4831.27438 4830.46367  0.02%     -    0s
     0     0 4830.75518    0    7 4831.27438 4830.75518  0.01%     -    0s
     0     0 4830.87111    0    7 4831.27438 4830.87111  0.01%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 4

Explored 0 nodes (141 simplex iterations) in 0.22 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.831274381378e+03, best bound 4.830871107972e+03, gap 0.0083%