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.