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

namespace aaa
{
    class Program
    {
        static void Main(string[] args)
        {
            int N1 = int.Parse(Console.ReadLine());
            int N2 = int.Parse(Console.ReadLine());
            if (N1 == N2)
            {
                Console.WriteLine(N2);
                Environment.Exit(0);
            }
            for (int i = N2; i >= 0; )
            {
                N2 = i;
                i = N1 % N2;
                N1 = N2;
                if(N1 % i == 0 && N2 % i == 0)
                {
                    Console.WriteLine(i);
                    break;
                }
            }
        }
    }
}