Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:09:38 2012

Optimize a model with 780 rows, 173 columns and 1560 nonzeros
Presolve removed 178 rows and 2 columns
Presolve time: 0.00s
Presolved: 602 rows, 171 columns, 1323 nonzeros
Variable types: 0 continuous, 171 integer (171 binary)
Found heuristic solution: objective 50.0000000

Root relaxation: objective 7.000000e+01, 330 iterations, 0.01 seconds

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

     0     0   70.00000    0  132   50.00000   70.00000  40.0%     -    0s
     0     0   68.58310    0  168   50.00000   68.58310  37.2%     -    0s
H    0     0                      51.0000000   68.58310  34.5%     -    0s
H    0     0                      52.0000000   68.58310  31.9%     -    0s
     0     0   67.62982    0  169   52.00000   67.62982  30.1%     -    0s
     0     0   66.99480    0  170   52.00000   66.99480  28.8%     -    0s
     0     0   66.58953    0  168   52.00000   66.58953  28.1%     -    0s
     0     0   66.45685    0  170   52.00000   66.45685  27.8%     -    0s
     0     0   66.25426    0  169   52.00000   66.25426  27.4%     -    0s
     0     0   66.08905    0  171   52.00000   66.08905  27.1%     -    0s
H    0     0                      54.0000000   66.08905  22.4%     -    0s
     0     0   65.84602    0  169   54.00000   65.84602  21.9%     -    0s
     0     0   65.61614    0  170   54.00000   65.61614  21.5%     -    0s
     0     0   65.45923    0  170   54.00000   65.45923  21.2%     -    0s
     0     0   65.32849    0  169   54.00000   65.32849  21.0%     -    0s
     0     0   65.24060    0  168   54.00000   65.24060  20.8%     -    0s
     0     0   65.04904    0  169   54.00000   65.04904  20.5%     -    0s
     0     0   64.93904    0  170   54.00000   64.93904  20.3%     -    0s
     0     0   64.90239    0  169   54.00000   64.90239  20.2%     -    0s
     0     0   64.88332    0  170   54.00000   64.88332  20.2%     -    0s
     0     0   64.88332    0  170   54.00000   64.88332  20.2%     -    0s
     0     2   64.88173    0  170   54.00000   64.88173  20.2%     -    0s
H   18    18                      55.0000000   64.88173  18.0%  65.2    0s
H  163    56                      57.0000000   63.57980  11.5%  53.9    0s
   612   210   58.42857    9  170   57.00000   62.26162  9.23%  48.3    5s
  2684   706   60.23810   18  129   57.00000   60.70548  6.50%  41.6   10s
  6299   472   58.09091   32  116   57.00000   59.00000  3.51%  34.0   15s

Cutting planes:
  Gomory: 4
  Zero half: 81
  Mod-K: 1

Explored 7193 nodes (233016 simplex iterations) in 15.90 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.700000000000e+01, best bound 5.700000000000e+01, gap 0.0%