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.*;
class Main{
	public static void main(String[]args){
    	Scanner in = new Scanner(System.in);
      	int x = in.nextInt(), y = in.nextInt(), z = 0;	
      	if(x==1&&y==2||x==2&&y==1)
          z = 3;
        else if(x==2&&y==3||x==3&&y==2)
       	  z = 1;
      	else if(x==3&&y==1||x==1&&y==3)
          z = 2;
      	System.out.println(z);
    }
} 