UVA302 John's trip

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=5&page=show_problem&problem=238 [PDF](https://uva.onlinejudge.org/external/3/p302.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA302/932a9cfc065c61c2816e352ff38fd877e1bb542d.png)

Input Format

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Output Format

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