UVA509 RAID技术 RAID!

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=7&page=show_problem&problem=450 [PDF](https://uva.onlinejudge.org/external/5/p509.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA509/196709a0522cff58dd6b77a164bbdbb338e90c87.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA509/6c8c154bfac827efc90a4eeb358f3d5ee53280dd.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA509/ba9e531f31b11cbae8db13764a50df6623d91f90.png)