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

public class Solution {

    static long sumOfGroup(int k) {
        // Return the sum of the elements of the k'th group.
        /* 1, 3 5, 7 9 11, 13 15 17 19, 21 23 25 27 29, 31
           0  1 2  3 4 5   6  7   8  9  10 11 12 13 14  15   
           1  2    3       4            5                6 
           k = 4
           13+15+17+19 = 64 
           */
          long result = k*k*k;
        return result;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int k = in.nextInt();
        long answer = sumOfGroup(k);
        System.out.println(answer);
        in.close();
    }
}