I. Write a program that will calculate the sum of the squares of  the consecutive numbers starting from 1
to the number, user entered.  You should provide two ways to do it.
(a) Accumulation Way
(b) Mathematics Formula: 1²+2²+3²+4²+5²+...+n² = n(n+1)(2n+1) / 6

II. According to each method, you calculate the running time.  Please display the number of time units needed for each statement.