import java.util.*;


public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        ArrayList<Integer> array = new ArrayList<>();
        array.add(sc.nextInt());
        array.add(sc.nextInt());

        if(!array.contains(1))
          System.out.println(1);
        else if(!array.contains(2))
          System.out.println(2);
        else
          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