12
node 10, 1.0, 1.0, 25.0
node 20, 2.0, 2.0, 20.0
node 30, 4.0, 4.0, 17.0
node 35, 5.0, 5.0, 21.0
node 50, 4.0, 7.0, 19.0
bcst from 10
bcst from 35
bcst from 20
bcst from 35