Sum of Fibonacci Series

Name: InsidCode
Author: Namish Yadav

Difficulty: Medium

Phase: 2 · Looping and Patterns

XP Reward: 20 XP

Topics: Looping and Patterns, Medium

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

Problem Description

Given N (>= 1), print the sum of the first N Fibonacci numbers. 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: 5

Output: 7

Explanation: Sample execution for input 5