import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		int x = in.nextInt();
		int y = in.nextInt();
		int temp = 0;
		if(x == y) System.out.println(x);
		else if(x >= y) {
			while(x % y > 0) {
				temp = x % y;
				x = y;
				y = temp;
			}
			System.out.println(temp);
		}
		else {
			while(y % x > 0) {
				temp = y % x;
				y = x;
				x = temp;
			}
			System.out.println(temp);
		}
	}
}


/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