import java.util.Scanner;

// A - Round One
// https://atcoder.jp/contests/abc148/tasks/abc148_a
public class Main {

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

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