import java.util.*;

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);
        }
        if((a==2 && b==3)||(a==3 && b==2)){
            System.out.println(1);
        }
        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