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 s=a.add(b);
		BigInteger p=a.multiply(b);
		System.out.println(s.gcd(p));
	}
}