1402: sum of all integer numbers
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Description
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.
Output
Write a single integer number that is the sum of all integer numbers lying between 1 and N inclusive.
Sample Input Copy
3
Sample Output Copy
6