Fibonacci-recursion

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp4
{
    class Program
    {
        static int Fib(int n)
        {
            if (n == 1 || n == 2)
            {
                return 1;
            }

            return Fib(n - 1) + Fib(n - 2);
        }

        static void Main()
        {
            var n = int.Parse(Console.ReadLine());

            Console.WriteLine(Fib(n));
        }
    }
}