
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long a, b;
		a = sc.nextLong();
		b = sc.nextLong();
		long tmp = 0;
		if (a < b) {
			tmp = a;
			a = b;
			b = tmp;
		}
		while (a % b != 0) {
			tmp = a;
			a = b;
			b = tmp % b;
		}
		System.out.println(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