圆周上的三角形 Probability Through Experiments

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=441&page=show_problem&problem=3980 [PDF](https://uva.onlinejudge.org/external/125/p12535.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12535/0a47243bec2662c630cdaebacd1b838a2b28ce25.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12535/0f4393dcdaadfba959f8386754ce799542e567de.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12535/529db3c068a6642cb6375821258ce170b1103069.png)

输入输出样例

输入样例 #1

4 71
234.600
33.576
20.375
84.908
7 7
11.586
114.435
248.411
108.640
287.629
150.224
340.481
0 0

输出样例 #1

Case 1: 2
Case 2: 12