package com.company;

import java.util.HashSet;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long a = scanner.nextLong();
        HashSet<Integer> hashSet = new HashSet<Integer>();
        for(int i = 2;i*i<=a;i++)
        {
            int count = 0;
            while(a % i == 0)
            {
                a /= i;
                count++;
            }
            if(count % 2 == 1)
            {
                hashSet.add(i);
            }
        }
        long y = 1;
        for(Integer element : hashSet)
        {
            y *= (long)element;
        }
        System.out.println(y);
    }
}