UVA303 Pipe

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=5&page=show_problem&problem=239 [PDF](https://uva.onlinejudge.org/external/3/p303.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA303/57d8c4a1aee5b3ad59c8b68b40b5fb293470f271.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA303/b05c18dafdd6ae4abec30175d51570cbd19ac7d0.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA303/50bdfcec22a567866a3402c50757ab5c61ab04c2.png)