UVA12149 Feynman

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=243&page=show_problem&problem=3301 [PDF](https://uva.onlinejudge.org/external/121/p12149.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12149/4b5a586c1450df15f79fc564f32da2556ca11d79.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12149/dc996720db699546280fb8e6c5cd82281fc03795.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12149/38d9c1cc1cad3058388117117631972849a6a8d0.png)