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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;

class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int A = in.nextInt();
        int B = in.nextInt();
        Choise(A, B);
    }

    private static void Choise(int a, int b) {
        if (a >= 1 && a <= 3 && b >= 1 && b <= 3) {
            if (a != b) {
                if (a == 1) {
                    if (b == 2) {
                        System.out.println(3);
                        return;
                    } else {
                        System.out.println(2);
                        return;
                    }
                }
                if (a == 2) {
                    if (b == 1) {
                        System.out.println(3);
                        return;
                    } else {
                        System.out.println(1);
                        return;
                    }
                }
                if (a == 3) {
                    if (b == 2) {
                        System.out.println(1);
                        return;
                    } else {
                        System.out.println(2);
                        return;
                    }
                }
            }
        }
    }
}