UVA11783 Nails

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=117&page=show_problem&problem=2883 [PDF](https://uva.onlinejudge.org/external/117/p11783.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11783/03158fe3ea2e19356e65ffbfb357f75e51132c75.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11783/2c400827df26c4011edbcd69dd3a5419640fd63a.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11783/4e1996aa9208295ca1a541df4d310b24fa29af6d.png)