import java.util.Scanner;
class Main {
	public static void main(String[] args){
		final int Number=100;
		try(Scanner sc = new Scanner(System.in)){
			int N = Integer.parseInt(sc.next());
			int M = Integer.parseInt(sc.next());
			int c =gcd(N,M);
			System.out.println(c);
		}
	}
	public static int gcd(int N, int M){
		int max=Math.max(N, M);
		int min=Math.min(N, M);
		
		if(max%min==0){
			return min;
		}else{
			return gcd(max%min,min);
		}
	}
}
/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