import java.util.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
        // 整数の入力
		int a = sc.nextInt();
        int b = sc.nextInt();
        int ans = 0;
        if (a + b == 3)
            ans = 3;
        else if (a + b == 4)
            ans = 2;
        else
            ans = 1;

		System.out.println(ans);
	}
}
/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