Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:29 2012

Optimize a model with 555 rows, 540 columns and 1777 nonzeros
Presolve removed 52 rows and 31 columns
Presolve time: 0.01s
Presolved: 503 rows, 509 columns, 1653 nonzeros
Variable types: 339 continuous, 170 integer (170 binary)

Root relaxation: objective 5.032421e+04, 240 iterations, 0.00 seconds

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

     0     0 50324.2092    0   78          - 50324.2092     -      -    0s
H    0     0                    79669.000000 50324.2092  36.8%     -    0s
     0     0 60953.9115    0    8 79669.0000 60953.9115  23.5%     -    0s
     0     0 61072.5283    0   11 79669.0000 61072.5283  23.3%     -    0s
     0     0 61075.4283    0    5 79669.0000 61075.4283  23.3%     -    0s
     0     0 61076.1923    0    6 79669.0000 61076.1923  23.3%     -    0s
     0     0 61078.7840    0    5 79669.0000 61078.7840  23.3%     -    0s
     0     0 61081.8911    0    4 79669.0000 61081.8911  23.3%     -    0s
     0     0 61083.1310    0    3 79669.0000 61083.1310  23.3%     -    0s
H    0     0                    61177.000000 61083.1310  0.15%     -    0s
     0     0 61083.1310    0   58 61177.0000 61083.1310  0.15%     -    0s
     0     0 61083.1310    0    3 61177.0000 61083.1310  0.15%     -    0s
     0     0 61083.1310    0    3 61177.0000 61083.1310  0.15%     -    0s
     0     0 61083.2527    0    6 61177.0000 61083.2527  0.15%     -    0s
     0     2 61083.6936    0    6 61177.0000 61083.6936  0.15%     -    0s
*   16     4               4    61128.000000 61096.4246  0.05%   2.1    0s

Cutting planes:
  Gomory: 10
  Cover: 1
  Flow cover: 35
  Flow path: 12

Explored 20 nodes (846 simplex iterations) in 0.49 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.112799999996e+04, best bound 6.112519254768e+04, gap 0.0046%