import java.util.Scanner;
import java.io.*;
public class Main

{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        int b=sc.nextInt();
        if(a==1&&b==2||a==2&&b==1)
        System.out.println(3);
        else if(a==2&&b==3||a==3&&b==2)
        System.out.println(1);
        else if(a==1&&b==3||a==3&&b==1)
        System.out.println(2);
    }
}
/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