UVA412 Pi

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=6&page=show_problem&problem=353 [PDF](https://uva.onlinejudge.org/external/4/p412.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA412/fdbb6010bc3ae1effafa1a0e693bf4171678cf1e.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA412/852b4afab72ab5a8b8bce391be9e6fb398eb30bc.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA412/172e0d3c4ccfc0e906ce3127a6459de019c33b91.png)