16
1 R 1
2 R 1
3 R 1
4 R 1
6 W 1
8 R 3
10 R 5
12 W 5
14 R 7
15 R 9
16 R 11
17 R 3
18 R 5
19 R 3
20 R 3
24 R 3
26 R 3
28 R 3
30 R 1