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?

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}.

Constraints

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

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

见题面 Input 部分

见题面 Output 部分