import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner std = new Scanner(System.in);
		int a = Integer.parseInt(std.next());
		int b = Integer.parseInt(std.next());
		int temp;
		if(a<b){temp=b; b=a; a=temp;}

		int m = a%b;
		while(m!=0){
			temp = a;
			a = b;
			b = temp%b;
			m = a%b;
		}
		System.out.println(b);
	}
}
/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