import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int y = sc.nextInt();

		System.out.println(calc(x, y));
	}

	private static int calc(int x, int y) {
		if (x < y) {
			int tmp = x;
			x = y;
			y = tmp;
		}

		while (y > 0) {
			int r = x % y;
			x = y;
			y = r;
		}

		return x;
	}
}
/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