Problem:
Score : 100 points

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

Solution in C (GCC 5.4.1) (judge verdict: Accepted)

/*
Program		: circle.c
Description	: Calculating the ratio of an area of a circle to another circle
Author		: Rey Rizki
Date		: 16 November 2019
Time        : 7:45 P.M. to 
Compiler	: gcc Ubuntu 7.4.0
*/

#include <stdio.h>

int main() {
    // DECLARATION
    int r;                          // the radius of a cricle

    // INPUT
    scanf("%d", &r);

    // OUTPUT
    printf("%d\n", r * r);

    return 0;
}