import java.util.Scanner;

public class Ok {
    public static int Fib(int num) {
        if (num == 0 || num == 1)
            return num;
        else
            return Fib(num - 2) + Fib(num - 1);
    }

    public static void main(String[] args) {
        System.out.println(Fib(6));

    }
}