Problem Statement

You will make a right triangle using $3$ sticks of positive length.
The lengths of $2$ of the sticks are known, so find the length of the remaining $1$ stick.
Since you want the stick used to be as short as possible, find the minimum such length.

Input

a b

The lengths of the $2$ sticks are given on $1$ line, separated by a space.

All inputs are integers.
$1 \le a,b \le 1000$

Output

Output the minimum length of the remaining $1$ stick needed to make a right triangle.
Your answer is considered correct if its absolute error or relative error is at most $10^{-6}$.

Sample

4 5

3.0000000000

5 3

4.0000000000

3 4

2.6457513111