package no441;

import java.math.BigInteger;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		BigInteger a = sc.nextBigInteger();
		BigInteger b = sc.nextBigInteger();
		BigInteger sum = a.add(b);
		BigInteger mul = a.multiply(b);
		System.out.println(sum.gcd(mul));
	}

}