UVA11500 Vampires

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=27&page=show_problem&problem=2495 [PDF](https://uva.onlinejudge.org/external/115/p11500.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11500/b5e2ba559bc7d045434a2b961827de4028360fcd.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11500/7a4b3e75fea1fe46111ef088d2fd9f8adfcd79c8.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11500/f82e35498b4c6e0b0c823859fc990f2d19cb36cb.png)