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

//YukiCoder300 平方数
//http://yukicoder.me/problems/no/300
class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("4");
            //1
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("8");
            //2
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("459431198626");
            //114514
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        long X = long.Parse(InputList[0]);

        if (X == 1) {
            Console.WriteLine(1);
            return;
        }

        Dictionary<long, int> SoinSuuDict = ExecSoinSuuBunkai(X);
        long Answer = 1;
        foreach (var EachPair in SoinSuuDict) {
            if (EachPair.Value % 2 == 1)
                Answer *= EachPair.Key;
        }
        Console.WriteLine(Answer);
    }

    //素因数分解
    static Dictionary<long, int> ExecSoinSuuBunkai(long pTarget)
    {
        var WillReturn = new Dictionary<long, int>();
        for (long I = 2; I <= pTarget; I++) {
            while (pTarget % I == 0) {
                if (WillReturn.ContainsKey(I))
                    WillReturn[I]++;
                else WillReturn[I] = 1;

                pTarget /= I;
            }
        }
        return WillReturn;
    }
}