import java.util.Scanner;

public class Main {

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

		while(x%4==0) x=x/4;

		for(long i=3; i*i<x; i += 2){
			while(x%(i*i) == 0) x=x/(i*i);
		}

		System.out.println(x);

	}
}