import java.util.Scanner;

class Main {
	public static void main(String args[]){
		Scanner scan = new Scanner(System.in);
		
		int x = scan.nextInt();
		int y = scan.nextInt();
		
		int tmp;
		
		if(x > y) {
			while ((tmp = x % y) != 0) {
	            x = y;
	            y = tmp;
	        }
			System.out.println(y);
		}else if(x < y) {
			while ((tmp = y % x) != 0) {
	            y = x;
	            x = tmp;
	        }
			System.out.println(x);
		}else System.out.println(y);
	}
}
/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