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

namespace ExMaxGongYueShu

{
    class MaxGongYueShu
    {
        public float maxGongYueShu(int n1,int n2)
        {
            int temp = Math.Max(n1, n2);
            n2 = Math.Min(n1, n2);//n2中存放两个数中最小的
            n1 = temp;//n1中存放两个数中最大的
            while(n2!=0)
            {
                n1 = n1 > n2 ? n1 : n2;//使n1中的数大于n2中的数
                int m=n1 % n2;
                n1 = n2;
                n2 = m;
            }

            return n1;
        }
        static void Main(string[] args)
        {
            int n1=Convert.ToInt32 (Console.ReadLine());
            int n2 = Convert.ToInt32(Console.ReadLine());
            if (n1 * n2 != 0)
            {
                MaxGongYueShu m = new MaxGongYueShu();
                Console.WriteLine(m.maxGongYueShu(n1, n2));
            }
            else
            {
                Console.WriteLine("这两个数不能为0。");
            }
        }
    }
}