import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		@SuppressWarnings("resource")
		Scanner scanner = new Scanner(System.in);

		int a = scanner.nextInt();
		int b = scanner.nextInt();
		int c = a + b;

		switch (c) {
		case 3:
			System.out.println(3);
			break;
		case 4:
			System.out.println(2);
			break;
		case 5:
			System.out.println(1);
			break;
		}

	}

}
/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