UVA658 这不是bug，而是特性 It's not a Bug, it's a Feature!

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=8&page=show_problem&problem=599 [PDF](https://uva.onlinejudge.org/external/6/p658.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA658/3980280739ce31d9b96acdbe804068ca33cab9fc.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA658/7cd2a79ba43bd41cebdbf074b7d149ab2dda68b0.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA658/369bfa04b6ac1cccb3b218de0bdd2f643cf70364.png)