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 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main(){
    int N=0;
    int i=0,j=0,X,k=0,sum=0;
    char s[200];
    char t[100];

    scanf("%d", &N);
    scanf("%s", s);
    for(;i<N/2;i++){
      //printf("%c\n", s[i]);
      if(s[i] != s[i+N/2]){
        k++;
      }
    }

    if(k != 0){
      printf("Yes");
    }else{
      printf("No");
    }

    return 0;
}