import java.util.*;
 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 && b==2){
        System.out.println("3");
        return;
      }
      if(a==1 && b==3){
        System.out.println("2");
        return;
      }
      if(a==2 && b==1){
        System.out.println("3");
        return;
      }
      if(a==2 && b==3){
        System.out.println("1");
        return;
      }
      if(a==3 && b==1){
        System.out.println("2");
        return;
      }
      if(a==3 && b==2){
        System.out.println("1");
        return;
      }
    }
}

/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