import java.util.Scanner;

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

}
/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