代数数列的求和问题计算的运用,怎么采用C程序的编程思想的代码具体编写的过程步骤?

Problem Description
Ice Rain------I was waiting for a girl, or waiting for been addicted to the bitter sea. Love for irrigation in silence. No one considered whether the flowers came out or wither. Love which I am not sure swing left and right. I had no choice but to put my sadness into my heart deeply.

Yifenfei was waiting for a girl come out, but never.
His love is caught by Lemon Demon. So yifenfei ’s heart is “Da Xue Fen Fei” like his name.
The weather is cold. Ice as quickly as rain dropped. Lemon said to yifenfei, if he can solve his problem which is to calculate the value of , he will release his love.
Unluckily, yifenfei was bored with Number Theory problem, now you, with intelligent, please help him to find yifenfei’s First Love.

Input
Given two integers n, k(1 <= n, k <= 109).

Output
For each n and k, print Ice(n, k) in a single line.

Sample Input
5 4
5 3

Sample Output
5
7

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