Reccursive Fibonacci - Arrays

using System;
using System.Collections.Generic;

namespace P5CalculateSequenceWithQueue
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            Console.WriteLine(getFibonacci(n));
        }

        private static long getFibonacci(int n)
        {
            Stack<long> numbers = new Stack<long>();
            long a = 0;
            long b = 1;

            numbers.Push(a);
            numbers.Push(b);

            for (int i = 1; i < n; i++)
            {
                long c = a;
                a = numbers.Peek();
                numbers.Push(c + b);
                b = numbers.Peek();
            }
            return numbers.Peek();
        }
    }
}