import java.util.Scanner;
public class Main{
	public static void main(String[] args){
		Scanner s=new Scanner(System.in);
		int x=s.nextInt();
		int y=s.nextInt();
		int z=1;
		while(z!=0){
			z=x%y;
			x=y;
			y=z;
		}
		System.out.println(x);
	}
}

/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