OnlineJudge 3 现已推出。点此体验新版：Yuanfang，what do you think ? | SDUT OnlineJudge

### Yuanfang，what do you think ?

Time Limit: 1000 ms
Memory Limit: 65536 KiB

#### Problem Description

Yuanfang is the best student in the class. Every time when the teacher comes up with a hard problem and it seems no student can solve it, He always says: "Yuanfang , what do you think?".

One day, They had a math class,The teacher said:”Let’s calculate the sum of 1^2+2^2…+n^2，Yuanfang, what do you think?"

Yuanfang wanted to solve this problem quickly. So he came to you, the only programmer he knows, for help.

You should write a program to calculate SUM(n)=1^2+2^2…+n^2 to help him.

#### Input

There are several test cases.

Each case has an integer n (1≤n≤1000) in a line.

#### Output

For each test case，output one line containing a result SUM(n).

#### Sample Input

1 10

#### Sample Output

1 385