# Ring

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 122.174 megabytes

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.

## Examples

Input #1

Answer #1

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Acceptance rate 34%