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