import java.util.Scanner;

public class Test {
	public static Scanner sc = new Scanner(System.in);

	public static void main(String[] args) {
		long n = sc.nextLong();
		for(long t = 2; t*t <= n;){
			if(n % (t*t) == 0){
				n /= t*t;
			} else {
				t++;
			}
		}
		System.out.println(n);
	}
}