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>
#include <stdlib.h>
#include <math.h>
#include <limits.h>
#include <string.h>



int main(void) {
int N;
scanf("%d\n",&N);

char S[N];
scanf("%s",S);
if (N==1){printf("No");
return 0;}
char T1[N/2];
char T2[N/2];
for (int i=0;i<N/2;i++){
  T1[i]=S[i];
  T2[i]=S[(N/2)+i];
}
if (strcmp(T1,T2)==0) printf("Yes");
else printf("No");
return EXIT_SUCCESS;
}