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 $10^{-2}$.