import java.util.Scanner;

//AtCoder Beginner Contest 148
//A - Round One
public class Main {

	static final int MOD = 1000000007;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = Integer.parseInt(sc.next());
		int B = Integer.parseInt(sc.next());

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