import java.io.*;
import java.util.*;

public class Main
{
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int y = sc.nextInt();
		euclid(x,y);
	}
	public static void euclid(int x , int y)
	{
		int temp;
		if (x == 0 || y == 0) {
			System.out.println((x+y));
			return ;
		}
		if(x < y){
			temp = x;
			x = y;
			y = temp;
		}
		
		euclid(y,x % y);
	}
}
/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