16
0 0 0 24
1 1 0 24
2 0 0 24
3 1 0 24
4 0 7 24
5 1 7 24
6 0 8 22
7 1 8 22
8 0 9 19
9 1 9 19
10 0 10 17
11 1 10 17
12 0 13 16
13 1 13 16
14 0 13 16
15 1 13 16