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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.util.Scanner;
class Main
{
	public static void main(String args[])
	{
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        String s=sc.next();

        if(n%2!=0){
            System.out.println("No");
        }
        else{
            String t1=s.substring(0,(n/2)-1);
            String t2=s.substring(n/2,n-1);
            if(t1.equals(t2)){
                System.out.println("Yes");
            }
            else{
                System.out.println("No");
            }
        }
    }
}