UVA13169 Balls and Needles

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=871&page=show_problem&problem=5069 [PDF](https://uva.onlinejudge.org/external/131/p13169.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13169/05a8a8244b63f3d31a65de2cb67a90a41080e5bb.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13169/9dbc84f7988b6fabcdc198b63cf6ffc4c14fa522.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13169/9dd3324c9ddf60a406ad724b478425f3f32a6436.png)