Problem:
Score: 100 points

Problem Statement

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.

Sample Input 1

3
1

Sample Output 1

2

When we know 3 and 1 are both wrong, the correct choice is 2.

Sample Input 2

1
2

Sample Output 2

3

Solution in Java7 (OpenJDK 1.7.0) (judge verdict: Accepted)

import java.util.*;

public class Main {
	public Main(int opt1, int opt2) {
		Map<Integer, Integer> map = new HashMap<>();
		map.put(1, 1);
		map.put(2, 2);
		map.put(3, 3);
		map.remove(opt1);
		map.remove(opt2);
		System.out.println(map.entrySet().iterator().next().getValue());

	}

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int opt1 = sc.nextInt();
		int opt2 = sc.nextInt();
		Main m = new Main(opt1, opt2);

	}
	
}