
import java.util.Scanner;

class Main {
	public static void main(String[] args) throws Exception {

		Scanner scanner = new Scanner(System.in);// ??\?????????????????????
		
		int num01 = scanner.nextInt();
		int num02 = scanner.nextInt();
		int min = Math.min(num01, num02);
		int max = Math.max(num01, num02);
		int gcd = 1;// ?????§??¬?´???°???????´????????????°
		int surplus = 1;
		
		while(true){
			surplus = max % min;
			max = min;
			min = surplus;
			if(surplus == 0){
				break;
			}
		}
		System.out.println(max);// ?????§??¬?´???°?????????
	}
}
/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