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