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

namespace yukicoder
{
    public class Program
    {
        public static void Main()
        {
            var x = long.Parse(Console.ReadLine());
            var k = PF(x);
            Console.WriteLine(k.Aggregate((x, y) => x * y));
        }
        public static List<long> PF(long x)
        {
            var k = new List<long>();
            var n = Math.Sqrt(x);
            for (var i = 2; i <= n; i++)
            {
                var j = 0;
                while (x % i == 0)
                {
                    j++;
                    x /= i;
                }
                if (j % 2 == 1)
                {
                    k.Add(i);
                }
            }
            k.Add(x);
            return k;
        }
    }
}