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.

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.

Constraints

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

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

见题面 Input 部分

见题面 Output 部分