Competitions

# WEEK5 GEOMETRY

# Ring

The area of a ring and radius of an external circle are given. Find the radius of an internal circle.

#### Input

Two real numbers are given: the area of a ring and the radius of an external circle, which does not exceed **100**.

#### Output

Print the radius of an internal circle with **2** digits after the decimal point.

Input example #1

50.2655 5

Output example #1

3.00