2504: AtCoder168 C - Colon

Memory Limit：128 MB Time Limit：1.000 S
Judge Style：Text Compare Creator：
Submit：3 Solved：0

Description

Input

Sample Input Copy 

3 4 9 0

Sample Output Copy 

5.00000000000000000000

HINT

Source/Category

SubmitSubmit RecordStatisticsShowOff!