Skyrk's Bar

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=823&page=show_problem&problem=4582 [PDF](https://uva.onlinejudge.org/external/127/p12730.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12730/f8ef6f9e205e4f5e53cbafb912c77745773a9013.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12730/2db30770b32fcb0ce0bbab38179765582508a07e.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12730/5f86d1f84e167f3c40743061217c0a05ab3a0713.png)

输入输出样例

输入样例 #1

3
4 2
7 2
10 3

输出样例 #1

Case #1: 1.5000
Case #2: 2.2857
Case #3: 2.4133