Square Summation

Time Limit: 1 sec

 

The Problem

Make a simple program that read one variable named N. Calculate the summation of the squares of the first N integer number(1² + 2² + 3² +…+N²).

 

 

The Input

The input file contain one integer number N (N<30).

 

The Output

Output will show the summation of the squares of the first N integer numbers.

 

Sample Input

20

 

Sample Output

2870

 

 

 

 

Problem Setter: Nezam Uddin

Special thanks to Shahin ShamS