import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {


    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int k = in.nextInt();
        BigInteger a = new BigInteger(k+"");
        BigInteger res = a.pow(3);
        System.out.println(res.toString());
        in.close();
    }
}