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 length;
char moziretu[101];
int hantei=0;
int i=0;
	scanf("%d",&length);
	scanf("%s",moziretu);
	length=length/2;

	while(i<length){
		if(moziretu[i]!=moziretu[i+length]){
			hantei=1;
			break;
		}else{
			i++;
		}
	}

	if(hantei==0){
		printf("Yes");

	}else{
		printf("No");
	}

}