import java.util.Scanner;
public class Main {
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		if(a >= b){
			gcd(a,b);
		}else{
			gcd(b,a);
		}
	}
	
	static void gcd(int n,int m){
		if((n % m) == 0) {
			System.out.println(m);
		}else if(m == 1){
			System.out.println(1);
		}else{
			int m1 = (n % m);
			gcd(m,m1);
		}
	}
}
/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