UVA12815 Taking the Stairs

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=861&page=show_problem&problem=4680 [PDF](https://uva.onlinejudge.org/external/128/p12815.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12815/1ab2ceb3082a8b57df599a9d966b022abc44b999.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12815/b01fdf78384dc8043cfd34a2e1982a40bf04cc3f.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12815/b3acc80af41dc199cf1682d5d391ec0e221bf71f.png)