import java.util.Scanner;
  
public class Main {
        public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                int a = sc.nextInt();
                int b = sc.nextInt();
                int ans = new Main().gcd(Math.max(a, b), Math.min(a, b));
                System.out.println(ans);
        }
        public int gcd(int b, int l) {
                if (l == 0)
                        return b;
                if (l == 1)
                        return l;
                return gcd(l, b % l);
        }
}

/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