0, 0;
1, 2;
2, 0;
3, 0;
4, 0;
5, 5;
6, 0;
7, 0;
8, 0;
9, 9;
11, 11;
13, 13;
15, 15;
17, 0;
18, 0;
19, 0;
20, 20;
22, 22;
23, 23;
25, 0;
