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

public class Solution {

    static BigInteger sumOfGroup(BigInteger k) {
        // Return the sum of the elements of the k'th group.
    	return (k.pow(3));
    }

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