Area Of Circle

easy
Question Solve Solutions 
1)You will be given a number r representing the radius .
2)You have to find the area of circle with given radius .

Input Format

A number r

Output Format

A double number n

Constraints

1<=r<=10^2

Notice

Try First, Check Solution later

1. You should first read the question and watch the question video.
2. Think of a solution approach, then try and submit the question on editor tab.
3. We strongly advise you to watch the solution video for prescribed approach.

Example

Input
2
Output
12.56
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