package no300;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long x_ = x;
		long y = 1;
		for(long i=2;i*i<=x_;i++) {
			int a = 0;
			while(x % i == 0) {
				x /= i;
				a++;
			}
			if (a % 2 == 1) {
				y *= i;
			}
		}
		if (x > 1) {
			y *= x;
		}
		System.out.println(y);
	}

}