using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Въведи m:");

        int m = Convert.ToInt32(Console.ReadLine());

        int n = F(m);

        Console.Write("F(m)={0} ", n);

    }

    static int F(int n)

    {

        if (n<=0)

            return 0;

        else if(n==1)

            return 1;

        else 

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

}

}