Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:28 2012

Optimize a model with 555 rows, 540 columns and 1782 nonzeros
Presolve removed 39 rows and 24 columns
Presolve time: 0.01s
Presolved: 516 rows, 516 columns, 1686 nonzeros
Variable types: 345 continuous, 171 integer (171 binary)

Root relaxation: objective 4.999116e+04, 256 iterations, 0.00 seconds

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

     0     0 49991.1551    0   91          - 49991.1551     -      -    0s
H    0     0                    84587.000000 49991.1551  40.9%     -    0s
     0     0 60781.1811    0   16 84587.0000 60781.1811  28.1%     -    0s
H    0     0                    64908.000000 60781.1811  6.36%     -    0s
     0     0 61195.3295    0   17 64908.0000 61195.3295  5.72%     -    0s
     0     0 61460.9399    0    6 64908.0000 61460.9399  5.31%     -    0s
     0     0 61464.8322    0    6 64908.0000 61464.8322  5.30%     -    0s
     0     2 61465.0166    0    6 64908.0000 61465.0166  5.30%     -    0s
H   10    10                    61986.000000 61465.3157  0.84%   2.5    0s
*   21    14              20    61603.000000 61465.3157  0.22%   2.5    0s
H   27     9                    61553.000000 61465.3203  0.14%   2.4    0s
*   43     3               4    61516.000000 61511.3259  0.01%   2.7    0s

Cutting planes:
  Gomory: 8
  Cover: 2
  Flow cover: 50
  Flow path: 38

Explored 44 nodes (508 simplex iterations) in 0.05 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.151600000000e+04, best bound 6.151132585574e+04, gap 0.0076%