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.io.*;

public class Main
{
	public static void main(String[] args) throws IOException
	{		
		BufferedReader br =
			new BufferedReader(new InputStreamReader(System.in));
			
			String str1 = br.readLine();
			int num1 = Integer.parseInt(str1);
			
			String str2 = br.readLine();
			int num2 = Integer.parseInt(str2);

		if(num1==1 && num2==2)System.out.println("3");
		else if(num1==1 && num2==3)System.out.println("2");
		else if(num1==2 && num2==1)System.out.println("3");
		else if(num1==2 && num2==3)System.out.println("1");
		else if(num1==3 && num2==1)System.out.println("2");
		else if(num1==3 && num2==2)System.out.println("1");
	}
}