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();
      	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