import java.util.Scanner;
public class Main{
 public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
   int X = sc.nextInt();
   int Y = sc.nextInt();
   
   
   if(X!=1&&Y!=1)   System.out.println(1);
   else if(X!=2&&Y!=2)   System.out.println(2);
   else   System.out.println(3);

   
 }
}
/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