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So'ngi izohlar

718. Ring
Vaqt limiti: 1 sekund
Xotira limiti: 64 MB

The area of a ring and radius of an external circle are set. Define radius of an internal circle.

   Input

   In a unique line set 2 real numbers, at first the area of a ring and through a blank - radius of an external circle. The radius of a circle does not exceed 100.

   Output

   In a unique line deduce radius of an internal circle with accuracy 2 signs after a decimal point.

Описание: prb924

Samples

Input

Output

1

50.2655 5

3.00

 

Tayyorladi: Azat Yusupov
Text from: e-olimp.com
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