import java.util.Scanner;


public class Main_yukicoder300 {

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

        long x = sc.nextLong();

        long ret = 1;
        for (long i = 2; i * i <= x; i++) {
        	int tmp = 0;
        	while (x % i == 0) {
        		tmp++;
        		x /= i;
        	}
        	
        	if (tmp % 2 == 1) {
        		ret *= i;
        	}
        }

        System.out.println(ret * x);

        sc.close();
    }
}