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

public class Main {
    static Scanner scan = new Scanner(System.in);
    static PrintWriter out = new PrintWriter(System.out);

    public static void main(String[] args) {
        BigInteger a = scan.nextBigInteger();
        BigInteger b = scan.nextBigInteger();
        BigInteger c = gcd(a.add(b),a.multiply(b));
        System.out.println(c);
    }

    private static BigInteger gcd(BigInteger a, BigInteger b) {
        if(a.compareTo(b) > 0) {
            gcd(b, a);
        }
        BigInteger tmp = BigInteger.ZERO;
        while(b.compareTo(BigInteger.ZERO) > 0) {
            tmp = a.remainder(b);
            a = b;
            b = tmp;
        }
        return a;
    }   
}