UVA13112 Are you ok?

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=871&page=show_problem&problem=5023 [PDF](https://uva.onlinejudge.org/external/131/p13112.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13112/ec9d92253f855c3511f5107a68ee0b9fc914699a.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13112/608f7f8b7f9de07e8a0a594040dd279a286652c3.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13112/66777d1b9e6f8b8c839261d5cf0f3f356babd67b.png)