import java.util.Scanner;

public class Main {
	static int gcd(int a, int b){
		int c;
		while (b>0){
			c=a%b;
			a=b;
			b=c;
		}
		return a;
	}
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int y = sc.nextInt();
		if (x>=y){
			int n =gcd(x,y);
			 System.out.println(n);
	} else if (y>x){
		int n =gcd(y,x);
			 System.out.println(n);
	}
	}
}

/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