UVA839 天平 Not so Mobile

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=780 [PDF](https://uva.onlinejudge.org/external/8/p839.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA839/396cd915f9728ebd97997ed3bfac66888d855b25.png)

Input Format

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Output Format

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