Chocolate Box

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=18&page=show_problem&problem=1589 [PDF](https://uva.onlinejudge.org/external/106/p10648.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10648/3892ed48b5a7122105a6a458768f2a76b90d3bda.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10648/f61b3086f69cfb28b80a77326ed63e2a9bd20765.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10648/980ae4c085af6e81005eda051b59a16ff53d9980.png)

输入输出样例

输入样例 #1

50 12
50 12
-1

输出样例 #1

Case 1: 0.1476651
Case 2: 0.1476651