import java.io.BufferedReader;
import java.io.InputStreamReader;
 
public class Main
{
	public static void main (String[] args) throws Exception
	{
		BufferedReader stdReader =
		new BufferedReader(new InputStreamReader(System.in));
		String natural[] = stdReader.readLine().split(" ",0);
		int x = Integer.parseInt(natural[0]);
		int y = Integer.parseInt(natural[1]);
		if (x < y) {
			x = x^y;
			y = x^y;
			x = x^y;
		}
		System.out.println(gcd(x, y));
	}
	private static int gcd(int x, int y) {
		return y == 0? x: gcd(y, x % 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