Neznaika and Gunka decided to meet to go visit Knopochka. They ran out of their houses at the same time to meet each other. Neznaika ran with speed
V1 meters per second, and Gunka with speed
V2 meters per second. In how many seconds they will meet if the distance between their houses is
S meters.
Input format
Given are three real numbers
S,
V1,
V2, каждое на отдельной строке.
Output format
Outpur the answer to the problem with an accuracy of at least 6 decimal places.
Example
| N |
Input |
Output |
| 1 |
100.0
15.0
20.0 |
2.857142857142857 |