using c=System.Console;
using b=System.Numerics.BigInteger;
using System.Linq;
public class Y{
public static void Main(){
var a=c.ReadLine().Split(' ').Select(n=>b.Parse(n)).ToList();		c.WriteLine(b.GreatestCommonDivisor(a[0]*a[1],a[0]+a[1]));
}}