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 Ten questions like this.