fib in C#

fib.cs

using System;

namespace ConsoleApplication
{
    class Program
    {
        public static long fib(int n)
        {
            if (n < 2) {
                return n;
            } else {
                return fib(n-1) + fib(n-2);
            }
        }

        static void Main()
        {
            Console.WriteLine(fib(48));
        }
    }
}