using System;
using System.Numerics;

public class Hello
{
    public static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        BigInteger a = long.Parse(line[0]);
        BigInteger b = long.Parse(line[1]);
        var res = BigInteger.GreatestCommonDivisor(a + b, a * b);
        Console.WriteLine(res);
    }
}