20
5 2 11
16 3 8
2 4 5
7 0 0
2 6 0
14 0 7
12 0 0
17 9 10
11 0 0
6 0 0
14 12 16
13 13 14
19 0 0
2 15 0
18 0 0
16 17 0
3 18 0
19 0 19
10 0 20
9 0 0