FibonacciNumbers

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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

            int fibonacci = 1;
            int fib = 1;

            for(int i = 0; i < n; i++)
            {
                int f = fib;
                fib = fib + fibonacci;
                fibonacci = f;
            }
            Console.WriteLine(fibonacci);
        }
    }
}