import java.io.*;

public class Main
{
	public static void main(String[] args) throws IOException
	{		
		BufferedReader br =
			new BufferedReader(new InputStreamReader(System.in));
			
			String str1 = br.readLine();
			int num1 = Integer.parseInt(str1);
			
			String str2 = br.readLine();
			int num2 = Integer.parseInt(str2);

		if(num1==1 && num2==2)System.out.println("3");
		else if(num1==1 && num2==3)System.out.println("2");
		else if(num1==2 && num2==1)System.out.println("3");
		else if(num1==2 && num2==3)System.out.println("1");
		else if(num1==3 && num2==1)System.out.println("2");
		else if(num1==3 && num2==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