using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Fibonachi(7));

    }

    static int Fibonachi(int n)

    {

        if (n == 0 || n == 1)

        {

            return n;

        }

        else

        {

            return Fibonachi(n - 1) + Fibonachi(n - 2);

        }

    }

}