using System;

class Program
{
    static void Main()
    {
        long x = long.Parse(Console.ReadLine());

        for (long i = 2; i <= Math.Sqrt(x); i++)
        {
            while (true)
            {
                if (x % (i * i) == 0) x /= i * i;
                else break;
            }
        }

        Console.WriteLine(x);
    }
}