import java.util.Scanner;

public class Main {
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();
		int M = sc.nextInt();
      
       if (N != 1 && M != 1) {
       	  System.out.print(1);
       } else if (N != 2 && M != 2) {
       	  System.out.print(2);
       } else if (N != 3 && M != 3) {
       	  System.out.print(3);
       }
	
	return;

	}
}
/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