import java.util.Scanner;

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) {
			if(B==2) {
				System.out.println(3);
			}else {
				System.out.println(2);
			}
		}else {
			if(A==2) {
				if(B==1) {
					System.out.println(3);
				}else{
					System.out.println(1);
				}
			}else {
				if(B==1) {
					System.out.println(2);
				}else {
					System.out.println(1);
				}
			}
		}
	}
}
/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