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();
		int[] R = {1,2,3};
		int result = 0;

		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