UVA12617 How Lader

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=602&page=show_problem&problem=4295 [PDF](https://uva.onlinejudge.org/external/126/p12617.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12617/794c13e52011c50898e95325a2ca39ed06adb925.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12617/5f6d2bf5af806c26f1ba0d9a27e0a1d4be208717.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12617/43a5b3b8f62028a60bc1f7779e8bc8e0442eb689.png)