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^2Yuanfang, 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 (1n1000) in a line.

Output

 For each test caseoutput one line containing a result SUM(n).

Sample Input

1
10

Sample Output

1
385

Hint

 

Source