import java.util.Scanner;

public class Main{
    public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
	int n1 = sc.nextInt();
	int n2 = sc.nextInt();
	System.out.println(euc(n1,n2));
    }
    private static int euc(int n1, int n2){
	if(n1 < n2) return euc(n2,n1);
	if(n2 == 0) return n1;
	return euc(n2,n1%n2);
    }
}


/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