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);
        BigInteger k = new BigInteger(in.next());
        System.out.println(k.pow(3));
        in.close();
    }
}