package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        final long X = sc.nextLong();

        long rest = X;
        long answer = 1;
        for(long i = 2; i * i <= rest; i++){
            int count = 0;
            while(rest % i == 0){
                rest /= i;
                count++;
            }

            if(count % 2 != 0){
                answer *= i;
            }
            //System.out.println(i + " : " + answer);
        }

        if(rest > 1){
            answer *= rest;
        }

        System.out.println(answer);
    }
}