import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);

		int x = stdIn.nextInt();
		int y = stdIn.nextInt();


		int answer = x % y;

		while (answer != 0) {
			x = y;
			y = answer;
			answer = x % y;
		}

		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