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

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        this.SetPrimeList(long.Parse(Reader.ReadLine()));

    }
    
    
    private void SetPrimeList(long max) {
        Dictionary<long, long> dic = new Dictionary<long, long>();
        long num = max;
        for(long i=2; i*i <= max; i++) {
            while (num % i ==0)
            {
                if(dic.ContainsKey(i)) {
                    dic[i]++;
                } else
                {
                    dic.Add(i, 1);
                }
                num = num / i;
            }
            if(num == 1) {
                break;
            }
        }
        if(num > 1) {
            dic.Add(num, 1);
        }
        long ans = 1;
        dic.Where(a=>a.Value % 2 == 1).ToList().ForEach(b=> ans = ans * b.Key);
        Console.WriteLine(ans);
        
    }


    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"


459431198626




 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}