#!/usr/bin/python2
# -*- coding: utf-8 -*-

"""Rozwiązanie zadania 104."""

def sum_from_one_to_n(number):
    """Placeholder"""
    if number < 1:
        return 0
    ret = 0
    for ile in range(1, number + 1):
        ret += ile * ile
    return ret

if __name__ == '__main__':
    print sum_from_one_to_n(2015)