using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using static System.Console;
using static System.Convert;
using static System.Math;
using static Extentions;

class IO
{
    int idx;
    string[] input;

    public IO(TextReader reader)
    {
        input = reader.ReadToEnd().Split(new[] { " ", Environment.NewLine },
            StringSplitOptions.RemoveEmptyEntries);
    }

    T Get<T>(Func<string, T> parser) => parser(input[idx++]);

    public string S => Get(s => s);
    public char C => Get(char.Parse);
    public int I => Get(int.Parse);
    public long L => Get(long.Parse);
    public double F => Get(double.Parse);
    public decimal D => Get(decimal.Parse);
    public BigInteger B => Get(BigInteger.Parse);

    T[] Gets<T>(int n, Func<string, T> parser)
        => input.Skip((idx += n) - n).Take(n).Select(parser).ToArray();

    public string[] Ss(int n) => Gets(n, s => s);
    public char[] Cs(int n) => Gets(n, char.Parse);
    public int[] Is(int n) => Gets(n, int.Parse);
    public long[] Ls(int n) => Gets(n, long.Parse);
    public double[] Fs(int n) => Gets(n, double.Parse);
    public decimal[] Ds(int n) => Gets(n, decimal.Parse);
    public BigInteger[] Bs(int n) => Gets(n, BigInteger.Parse);

    public void Write<T>(params T[] xs) => WriteLine(string.Join(" ", xs));
    public void Write(params object[] xs) => WriteLine(string.Join(" ", xs));
}

static class Extentions
{
    public static int[] Primes(int n)
    {
        if (n < 2) return Array.Empty<int>();

        var flgs = new bool[n + 1];
        for (var i = 3; i * i < n; i += 2)
            if (!flgs[i]) for (var j = i * i; j <= n; j += i) flgs[j] = true;

        var list = new List<int>() { 2 };
        for (var i = 3; i <= n; i += 2) if (!flgs[i]) list.Add(i);
        return list.ToArray();
    }

    public static long[] Factors(long x)
    {
        var list = new List<long>();

        foreach (var p in Primes((int)Sqrt(x)))
        {
            while (true)
            {
                long r;
                var q = DivRem(x, p, out r);
                if (r > 0) break;
                list.Add(p);
                x = q;
            }
        }

        if (x > 1) list.Add(x);
        return list.ToArray();
    }

    public static long Sqrt(long x) => (long)Ceiling(Math.Sqrt(x));

    public static long Product(this IEnumerable<long> seq)
        => seq.Aggregate(1L, (x, y) => x * y);
}

static class Program
{
    public static void Main()
    {
#if !DEBUG
        SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
#endif
        Solve(new IO(In));
        Out.Flush();
    }

    static void Solve(IO io)
    {
        var y = Factors(io.L)
            .GroupBy(x => x)
            .Where(x => x.Count() % 2 != 0)
            .Select(x => x.First())
            .Product();

        io.Write(y);
    }
}