Calculator Conundrum

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=27&page=show_problem&problem=2544 [PDF](https://uva.onlinejudge.org/external/115/p11549.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11549/bbbca0c23761f9509c7562abaf6847d7600424ae.png)

输入输出格式

输入格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11549/b54de288fa917d597d9504a4e92ebfb9855eeefb.png)

输出格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11549/1afe3f5e98ed8005c1f1378dd09f5fc25b61edec.png)

输入输出样例

输入样例 #1

2
1 6
2 99

输出样例 #1

9
99