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题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=12&page=show_problem&problem=1012 [PDF](https://uva.onlinejudge.org/external/100/p10071.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10071/aa6caddbb2b61dbd016ac2abb96d44c2bafc6d2b.png)

输入输出格式

输入格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10071/46793f4262eb7f837b9da6f7cfbf0af098f99fac.png)

输出格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10071/3c80b8e52e2e309b9da2c2cc35702e9a081581a6.png)

输入输出样例

输入样例 #1

0 0
5 12

输出样例 #1

0
120