import java.util.*;
 
public class Main {
	
	
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n1= sc.nextInt();
		int n2=sc.nextInt();
		cout(gcd(n1,n2));
	}
	
	public static int gcd(int a,int b){
		if(a%b==0) return b;
		else return gcd(b,a%b);
	}
	
	public static void showary(int[] ary){
		for(int i=0;i<ary.length-1;i++){
			System.out.print(ary[i]+" ");
		}
		cout(ary[ary.length-1]);
	}
	
	public static void cout(String n){
		System.out.println(n);
	}
	
	public static void cout(int n){
		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