import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n=Integer.valueOf(sc.next());
		int m=Integer.valueOf(sc.next());
		if(n==m){
			System.out.println(n);
			return;
		}else if(n>m){
			int temp=m;
			m=n;
			n=temp;
		}
		while(n!=0){
			m%=n;
			if(m==0){
				System.out.println(n);
				return;
			}
			n%=m;
		}
		System.out.println(m);
	}

}
/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