import java.util.*;
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)){
            System.out.println(3);

        }

        if ((A==2)&&(B==3)){
            System.out.println(1);

        }

        if ((A==3)&&(B==2)){
            System.out.println(1);

        }

        if ((A==3)&&(B==1)){
            System.out.println(2);

        }

        if ((A==2)&&(B==1)){
            System.out.println(3);

        }

        if ((A==1)&&(B==3)){
            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