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

Optimize a model with 555 rows, 540 columns and 1772 nonzeros
Presolve removed 53 rows and 30 columns
Presolve time: 0.01s
Presolved: 502 rows, 510 columns, 1652 nonzeros
Variable types: 337 continuous, 173 integer (173 binary)

Root relaxation: objective 4.546103e+04, 244 iterations, 0.00 seconds

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

     0     0 45461.0294    0   82          - 45461.0294     -      -    0s
H    0     0                    70672.000000 45461.0294  35.7%     -    0s
H    0     0                    70588.000000 45461.0294  35.6%     -    0s
     0     0 55460.4344    0   20 70588.0000 55460.4344  21.4%     -    0s
H    0     0                    67001.000000 55460.4344  17.2%     -    0s
     0     0 55933.9860    0    8 67001.0000 55933.9860  16.5%     -    0s
     0     0 55968.3316    0    3 67001.0000 55968.3316  16.5%     -    0s
     0     2 55973.8135    0    3 67001.0000 55973.8135  16.5%     -    0s
H    9     9                    56385.000000 55985.2482  0.71%   1.9    0s
*   24    12              23    56100.000000 55985.2482  0.20%   1.6    0s
*   40     5              15    55997.000000 55995.1499  0.00%   1.5    0s

Cutting planes:
  Gomory: 14
  Cover: 4
  Flow cover: 50
  Flow path: 28

Explored 41 nodes (425 simplex iterations) in 0.04 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.599700000000e+04, best bound 5.599514992272e+04, gap 0.0033%