UVA12084 Up the Stairs

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=242&page=show_problem&problem=3236 [PDF](https://uva.onlinejudge.org/external/120/p12084.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12084/63d8e8239421eb2a4960f7607e6dd94b07953ad6.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12084/f5b646539bcde19a680f69bbed0cf30d8f66476f.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12084/8c6220abecdadedb3545543e13eea2404b007915.png)