#D4905. Runner and Sniper
Runner and Sniper
Runner and Sniper
Example
Input
100 100 0 1
Output
1.16699564
inputFormat
Input
100 100 0 1
outputFormat
Output
1.16699564
样例
100 100 0 11.16699564
Example
Input
100 100 0 1
Output
1.16699564
Input
100 100 0 1
Output
1.16699564
100 100 0 11.16699564