Takahashi is solving quizzes. He has easily solved all but the last one.

The last quiz has three choices: 1, 2, and 3.

With his supernatural power, Takahashi has found out that the choices A and B are both wrong.

Print the correct choice for this problem.

Constraints

* Each of the numbers A and B is 1, 2, or 3.
* A and B are different.

Input

Input is given from Standard Input in the following format:


A
B


Output

Print the correct choice.

Examples

Input

3
1


Output

2


Input

1
2


Output

3
import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		Scanner scan = new Scanner(System.in);
		int a = Integer.parseInt(scan.nextLine());
		int b = Integer.parseInt(scan.nextLine());
		int ans;
		
		if ((a + b) % 3 == 0) {
			ans = 3;
		} else if ((a + b) % 3 == 1) {
			ans = 2;
		} else {
			ans = 1;
		}
		System.out.println(ans);
	}
}
