import java.util.*;

public class Main {
   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      
      String[] input = sc.nextLine().split(" ");
      int a = Integer.parseInt(input[0]);
      int b = Integer.parseInt(input[1]);
      
      System.out.println(gcd(a,b));
   }
   
   
   public static int gcd(int a, int b) {
      if (a % b == 0) {
         return b;
      } else {
         return gcd(b, a % b);
      }
   }
}

/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