Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:33:11 2012

Optimize a model with 1635 rows, 1620 columns and 5908 nonzeros
Presolve removed 157 rows and 50 columns
Presolve time: 0.01s
Presolved: 1478 rows, 1570 columns, 5586 nonzeros
Variable types: 1397 continuous, 173 integer (173 binary)

Root relaxation: objective 5.665463e+04, 277 iterations, 0.00 seconds

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

     0     0 56654.6313    0   11          - 56654.6313     -      -    0s
H    0     0                    58598.000000 56654.6313  3.32%     -    0s
H    0     0                    57543.000000 56654.6313  1.54%     -    0s
     0     0 56676.2289    0   18 57543.0000 56676.2289  1.51%     -    0s
     0     0 56676.5331    0   19 57543.0000 56676.5331  1.51%     -    0s
     0     0 56677.2553    0   17 57543.0000 56677.2553  1.50%     -    0s
H    0     0                    57056.000000 56677.2553  0.66%     -    0s
     0     0 56677.2553    0   11 57056.0000 56677.2553  0.66%     -    0s
     0     0 56677.2553    0   18 57056.0000 56677.2553  0.66%     -    0s
     0     0 56677.2553    0   17 57056.0000 56677.2553  0.66%     -    0s
     0     0 56677.2553    0   17 57056.0000 56677.2553  0.66%     -    0s
     0     2 56687.4938    0   17 57056.0000 56687.4938  0.65%     -    0s
*   21    14              20    56980.000000 56700.2027  0.49%   4.7    0s
H  108    48                    56961.000000 56756.7060  0.36%   5.1    0s
*  180    43              10    56901.000000 56796.8423  0.18%   4.9    0s
*  235    24              13    56869.000000 56824.5172  0.08%   4.8    0s

Cutting planes:
  Gomory: 2
  Flow cover: 8

Explored 273 nodes (1798 simplex iterations) in 0.26 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.686900000000e+04, best bound 5.686820440067e+04, gap 0.0014%