UVA501 Black Box

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=7&page=show_problem&problem=442 [PDF](https://uva.onlinejudge.org/external/5/p501.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA501/794b727ccb5ae482ad64212b50510c376fee2c00.png)

Input Format

N/A

Output Format

N/A