UVA10899 Billiard again

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=20&page=show_problem&problem=1840 [PDF](https://uva.onlinejudge.org/external/108/p10899.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10899/124a0abcb7904fd4f13ab12611c77aba56097d5c.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10899/b1ef4c55dc7203d7e69bbcbfe8695a9278f2b15e.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10899/ecd57d72df200356440e80d43063e10227cd146b.png)