209 - Professor’s Homework

Professor’s Homework

Time Limit: 1 sec


The Problem

Nora is learning summation of numbers. So her Professor has given her homework   “Summation of numbers from 1 to N”. Can you help Nora to complete her homework?


1 + 2 + 3 + … + N???



The Input

The input file contains 1 integer number N (N<=200).


The Output

Output will show the sum of series 1 to N numbers in a separate line.


Sample Input



Sample Output






Problem Setter: Shahin ShamS

Special thanks to Samia Safa Ahmed