import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] arrays = br.readLine().split(" ");
		
		int x = Integer.parseInt(arrays[0]);
		int y = Integer.parseInt(arrays[1]);
		
		if(x > y){
			System.out.println(gcd(x, y));
		}
		else {
			System.out.println(gcd(y, x));
		}

	}
	static int gcd(int x, int y) {

		if (y == 0) {
			return x;
		} else {
			return 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