import java.util.Scanner;
public class Main {
	public static void calcu(int a,int b){
		int ans=a;
		while(b!=0){
			ans = a % b; 
			a = b; 
			b = ans; 
		}
		System.out.println(a);
	}
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		if(a>b)
			calcu(a,b);
		else
			calcu(b,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