import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner input=new Scanner(System.in);
		int a=input.nextInt();
		int b=input.nextInt();
		System.out.println(gcd(a,b));
	}
	
	public static int gcd(int a,int b){
		return b==0 ? a : gcd(b,a%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