UVA470 Nasty Virus

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=6&page=show_problem&problem=411 [PDF](https://uva.onlinejudge.org/external/4/p470.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA470/4e63e0604b93d50a1d4152a9dd46b03710a04de3.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA470/b41d81037f632c67cc5fbc18bd5ec118836819b4.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA470/263fec38b805aeb498c1012870a6b5fd1ced61b0.png)