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

namespace New
{
    class Program
    {
        static void Main(string[] args)
        {
            long a = Convert.ToInt32(Console.ReadLine());
            long b = 1;
            long[] c=new long [100000];
            long[] d=new long [100000];
            c[0] = 0;
            while (a % 2 == 0)
            {
                c[0]+= 1;
                d[0]=2;
                b = 2;
                a /= 2;
            }
            long k = Convert.ToInt32(d[0]==2);

            for (int i = 3; a > 1; i = i + 2)
            {
                if (a % i == 0)
                {
                    k++;
                    b *= i;
                    d[k] = i;
                    c[k] = 0;
                    while (a % i == 0)
                    {
                        a /= i;
                        c[k] += 1;
                    }
                }
            }       
            long n=1;
            for (int i = 0; i < k; i++)
            {
                if (c[i] > n) {n *= d[i]; i--;}
            }
            Console.WriteLine(n);
        }
    }
}