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 <5000000; i++) {
            if (x % (i * i) == 0) {
                x /= (i * i);
            }
        }
        for (i = 2; i < 5000000; i++) {
            cnt = 0;
            while (x % i == 0) {
                x /= i;
                cnt++;
            }
            if (cnt % 2 == 1)
                y *= i ;
            if (x == 1)
                break;
        }
        System.out.println(y);
    }
}