Problem Statement

A shop sells a product whose regular price is $A$ yen (Japanese currency) for $B$ yen. By what percentage of the regular price is this product discounted?

Constraints

• $A$ and $B$ are integers.
• $1 ≤ B < A ≤ 10^5$

Input

Input is given from Standard Input in the following format:

$A$ $B$

Output

Print the answer as a decimal.
Your answer will be judged as correct when its absolute or relative error from our answer is at most $10^{-2}$.

Sample Input 1

100 80

Sample Output 1

20.0

If a product whose regular price is $100$ yen is sold for $80$ yen, it is discounted by $20$ percent of the regular price.

Sample Input 2

7 6

Sample Output 2

14.285714285714285714

Sample Input 3

99999 99998

Sample Output 3

0.00100001000010000100