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: Wrong Answer)

#include<stdio.h>

int main(){
	int N;
	char S[N];
	int i;
	int j;
	int n;
	char d;
	
	scanf("%d",&N);
	scanf(" ",&d);
	for(i=0;i<=N-1;i++){
		scanf("%c",&S[i]);
	}
		
	
	if((1<=N)&&(N<=100)){
		for(j=0;j<N/2;j++){
			if(S[j]!=S[N/2+j]){
				n++;
			}
		}
	}
	
	if(n==0){
		printf("Yes");
	}
		else{
			printf("No");
		}
	}