Sum of Even Numbers up to N

Name: InsidCode
Author: Namish Yadav

Difficulty: Easy

Phase: 2 · Looping and Patterns

XP Reward: 10 XP

Topics: Looping and Patterns, Easy

Supported Languages: Python, JavaScript, C, C++, Java

Problem Description

Given N, print the sum of all even numbers from 1 to N. Input Format: Read input from standard input (stdin). Output Format: Print the result to standard output (stdout).

Constraints

-10^9 <= N <= 10^9

Examples

Example 1

Input: 10

Output: 30

Explanation: Sample execution for input 10