using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace ConsoleApp1
{
    class Program
    {
        static int count(int n)
        {
            if (n == 1 || n == 2)
                return n;
            return count(n - 1) + count(n - 2);
        }

        static void Main(string[] args)
        {
            int res = count(5);

            Console.WriteLine(res);
        }
    }
}