UVA970 Particles

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=11&page=show_problem&problem=911 [PDF](https://uva.onlinejudge.org/external/9/p970.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA970/ef3c1289b936c8d197f7977a33ee950fa837323b.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA970/a937aaaba41c179f6ba95f103d9119e08b790137.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA970/8bf20f1b507bf0ff7cfeb87ba4f9e27bf55eb3a9.png)