UVA10690 Expression Again

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=18&page=show_problem&problem=1631 [PDF](https://uva.onlinejudge.org/external/106/p10690.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10690/5598b4682a81319a17c924e63b4e786424d75984.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10690/5422b73dd9ee06d49520f207045b1b7effbed416.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10690/ddda132640b513af6117b9bdc2cfbcc8d9e76fcf.png)