import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		long x = sc.nextLong();
		long y = sc.nextLong();

		sc.close();

		if(y > x) {
			long tmp;
			tmp = x;
			x = y;
			y = tmp;
		}

		long ans = gcd(x, y);

		System.out.println(ans);
	}

	private static long gcd(long x, long y) {

		if(y == 0) return x;

		return gcd(y, x%y);

	}
}
/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