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;

public 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==1) {
			System.out.println("No");
		} else {
			int mojisuHalf = n/2;
			String mojiLeft = s.substring(0,mojisuHalf);
			String mojiRight = s.substring(mojisuHalf);

			if (mojiLeft.equals(mojiRight)) {
				System.out.println("Yes");
			} else {
				System.out.println("No");
				}
		}
	}

}