sumofallintegernumbers
Your task is to find the sum of all integer numbers lying between 1 and N inclusive.
Input
There are multiple test cases.
The input consists of a single integer N that is not greater than 10000 by it's absolute value.
The input consists of a single integer N that is not greater than 10000 by it's absolute value.
Output
Write a single integer number that is the sum of all integer numbers lying between 1 and N inclusive.
Sample Input
3
Sample Output
6