using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CS2026
{ 
    class Utils
    {
        public static int GCD(int a, int b)
        {
            if (b == 0)
            {
                return a;
            }
            else
            {
                return GCD(b, a % b);
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(args[0]);
            int b = int.Parse(args[1]);
            int gcd = Utils.GCD(a, b);
            Console.WriteLine(gcd);
            Console.ReadLine();
        }
    }
}