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;
      	scanf("%d" , &n);	
      	char a[10000];
      	scanf("%s" , a);
      	int i = 0;	
      if(n&1){
      	  printf("No");
          return 0;
        	
      }
      for( i = 0 ; i < n/2 ; i++){
        	if(a[i] != a[n/2 + i]){
            	printf("No");
              	return 0;
        	}
        }
        printf("Yes");
              	       
    }