import java.util.*;

class Main{
	public static void main(String args[]){
		Scanner scan = new Scanner(System.in);
		int x = scan.nextInt();
		int y = scan.nextInt();
		int z;
		//??????????????????????????????
		//??´??° x, y(x >= y)??????????????? x ??¨ y ????????§??¬?´???°??? y ??¨ x % y ????????§??¬?´???°???????????????
		//????????§ x % y ??? x ??? y ??§?????£???????????§??????
		do{
			z = Math.max(x, y) % Math.min(x, y);
			if(z == 0){
				System.out.println(Math.min(x, y));
			}
			else{
				if(x > y){x = z;}
				else{y = z;}
			}
		}while(z != 0);
	}
}
/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