import java.util.*;
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