30 20
2 3 7 8 13 15 27 29 30 0
8 19 20 0
4 6 7 9 15 16 19 21 22 24 28 0
1 4 6 11 13 19 0
1 8 10 15 19 30 0
11 12 21 22 29 0
13 25 0
1 3 4 16 27 0
3 12 14 17 23 0
4 12 0
3 5 21 23 29 30 0
10 12 15 29 0
2 4 9 19 24 29 0
8 10 11 12 15 18 25 0
2 5 7 21 25 0
5 7 20 0
1 12 15 18 20 0
3 9 11 12 19 24 26 28 29 0
1 12 13 14 16 17 19 25 27 30 0
9 18 25 28 0