using static System.Math;
using System.Linq;
using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        var x = long.Parse(Console.ReadLine().Trim());
        var m = (int)Sqrt(x) + 1;
        var a = GeneratePrime(m);
        var d = getDic(x, a);
        getAns(d);
    }
    static void getAns(Dictionary<long, int> d)
    {
        var res = 1L;
        foreach (var x in d)
        {
            if (x.Value % 2 == 1) res *= x.Key;
        }
        Console.WriteLine(res);
    }
    static Dictionary<long, int> getDic(long x, List<int> a)
    {
        var acount = a.Count();
        var d = new Dictionary<long, int>();
        for (int i = 0; i < acount; i++)
        {
            if (a[i] > x) break;
            while (true)
            {
                if (x % a[i] == 0)
                {
                    if (d.ContainsKey(a[i])) d[a[i]]++;
                    else d[a[i]] = 1;
                    x /= a[i];
                }
                else break;
            }
        }
        d[x] = 1;
        return d;
    }
    static List<int> GeneratePrime(int m)
    {
        var a = new List<int>();
        int p;
        var sqrtMax = Math.Sqrt(m);
        var s = Enumerable.Range(2, m - 1).ToList();
        do
        {
            p = s.First();
            a.Add(p);
            s.RemoveAll(n => n % p == 0);
        }
        while (p < sqrtMax);
        a.AddRange(s);
        return a;
    }
}