import java.util.Scanner;

public class Main{
	public static int x;
	public static int y;
	public static int z;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		x= sc.nextInt();
		y = sc.nextInt();
		if(x > y){
			solve(x,y);
		}
		else{
			solve(y,x);
		}
		System.out.println(z);

	}

	public static void solve(int big,int small){
		z = big % small;
		if (z == 0){
			z = small;
		}
		else{
			solve(small,z);
		}

	}

}
/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