using System;
using System.Numerics;

namespace No442{
    public class Program{
        public static void Main(string[] args){
            Func<BigInteger, BigInteger, BigInteger> Gcd = null;
            Gcd = (a, b) => b == 0 ? a : Gcd(b, a % b);
            var input = Array.ConvertAll(Console.ReadLine().Split(), BigInteger.Parse);
            Console.WriteLine(Gcd(input[0] + input[1], input[0] * input[1]));
        }
    }
}