#!/bin/python3

import sys

def pow(x, y):
    return 1 if y == 0 else x * pow(x, y - 1)

def sumOfGroup(k):
    # Return the sum of the elements of the k'th group.
    return pow(k,3)

if __name__ == "__main__":
    k = int(input().strip())
    answer = sumOfGroup(k)
    print(answer)