Problem Statement

Given is an integer $r$.

How many times is the area of a circle of radius $r$ larger than the area of a circle of radius $1$?

It can be proved that the answer is always an integer under the constraints given.

Constraints

• $1 \\leq r \\leq 100$
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

$r$

Output

Print the area of a circle of radius $r$, divided by the area of a circle of radius $1$, as an integer.

Sample Input 1

2

Sample Output 1

4

The area of a circle of radius $2$ is $4$ times larger than the area of a circle of radius $1$.

Note that output must be an integer - for example, 4.0 will not be accepted.

Sample Input 2

100

Sample Output 2

10000