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();
    int c = 0;
    if (a==1) {
      if (b==2) {
        c = 3;
      }
      else {
        c = 2; 
      }
    }
    else if (a == 2) {
      if (b==1) {
        c = 3;
      }
      else {
        c = 1; 
      }
    }
    else {
      if (b==2) {
        c = 1;
      }
      else {
        c = 2; 
      }
    }
    System.out.println(c);
  }
}

/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