import java.util.*;

public class Main{
    public static void main(String[] srgs){
        Scanner sc=new Scanner(System.in);

        int a=sc.nextInt();
        int b=sc.nextInt();
        int c=0;
        if(a+b==3)c=3;
        if(a+b==4)c=2;
        if(a+b==5)c=1;
        System.out.println(c);
    }
}

/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