UVA13274 Christmas Tree

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=878&page=show_problem&problem=5198 [PDF](https://uva.onlinejudge.org/external/132/p13274.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13274/0e54e48b2b53a369c8a42b675d8a38aa9045960c.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13274/0728973676106f7a1afcfbe65067b3134e403685.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13274/10dfef1c1b6027c332fb9e9c52f928c2bdceef49.png)