UVA13137 Progressions

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=871&page=show_problem&problem=5048 [PDF](https://uva.onlinejudge.org/external/131/p13137.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13137/eac4c619fd228efa7f783db3e0e83a29c4a2b176.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13137/bf0f54b1a0eb54a128859e2ac49b0ed9e4b0477a.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13137/7807eb48b7a26c5c0f26fd2850bb8579e5d5cae2.png)