import java.util.Scanner;

public class Yukicoder300 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int cnt;
        long x = sc.nextLong(), y = 1, i;

        for (i = 2; i < 1000000; i++) {
            if (x % (i * i) == 0) {
                x /= (i * i);
            }
        }

        System.out.println(x);
    }
}