import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Main
{
    public static void main (String[] args) throws java.lang.Exception
	{
		Scanner s=new Scanner(System.in);
		int a=s.nextInt();
		int b=s.nextInt();
		int q=Math.max(a,b);
		int p=Math.min(a,b);
		if(p==1 && q==3)
		System.out.println("2");
		else if(p==2 && q==3)
		System.out.println("1");
	    else if(p==1 && q==2)
	    System.out.println("3");
	}}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz