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Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=27&page=show_problem&problem=2500 [PDF](https://uva.onlinejudge.org/external/115/p11505.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11505/7a5f38f587ea4a970df881bb78da8009ee651a2b.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11505/0f211278dc2c393e4cfe78e3d12c511b054534f3.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11505/f4532adf1e5308db8d795e3cb36680b6a24b3216.png)