UVA117 The Postal Worker Rings Once

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=53 [PDF](https://uva.onlinejudge.org/external/1/p117.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA117/605acb2795546a9dfae060c035e1811990d8f884.png)

Input Format

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Output Format

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