奶牛和轿车 Cows and Cars

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=16&page=show_problem&problem=1432 [PDF](https://uva.onlinejudge.org/external/104/p10491.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10491/b25d27a5e3c13d6e2fa5b6a343e8f5ecdf3cba26.png)

输入输出格式

输入格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10491/58bbf50a8476f0749164e40def44a03edc74ddba.png)

输出格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10491/c7613df82a6f6ac2a6927dfb4d1f7db990efe460.png)

输入输出样例

输入样例 #1

2 1 1
5 3 2
2000 2700 900

输出样例 #1

0.66667
0.52500
0.71056