import java.util.*;
class Main{
	public static void main(String[]args){
    	Scanner in = new Scanner(System.in);
      	int x = in.nextInt(), y = in.nextInt(), z = 0;	
      	if(x==1&&y==2||x==2&&y==1)
          z = 3;
        else if(x==2&&y==3||x==3&&y==2)
       	  z = 1;
      	else if(x==3&&y==1||x==1&&y==3)
          z = 2;
      	System.out.println(z);
    }
} 
/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