node  1 15  0
node  2 15  7
node  3 20  7.5
node  4 25  0
node  5 30  0
node  6 35  0
node  7 35  4
node  8 30  6
node  9 25  7
node  10  10  0
node  11  5 0
node  12  5 4
node  13  10  6
node  14  0 0
node  15  20  0
node  16  40  0
