# Fibonacci Number

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**Formula:**`F(n) = F(n - 1) + F(n - 2)`

, with `F(0) = 0`

and `F(1) = 1`

.

## Introduction to Fibonacci Number Calculator

The Fibonacci sequence is a series of numbers where each number after the first two is the sum of the two preceding ones. This calculator computes the *n-th* Fibonacci number given a non-negative integer *n*.

## Parameter usage:

`n`

= Non-negative integer representing the position in the Fibonacci sequence.

## Output:

- The
*n-th*Fibonacci number.

## Data validation

The parameter `n`

should be a non-negative integer.

## Summary

The calculator is used to find the Fibonacci number at a specific position in the sequence.

Tags: Mathematics, Fibonacci, Sequence