using System;

public class Program

{

    public static int fib(int first, int second)

    {

        int s;

        s = second + first;

        first = second;

        second = s;

        return s;

    }

    public static void Main()

    {

        int i, prev = 0, next = 1, s;

        Console.WriteLine("Fibonacci numbers");

        for (i = 0 ; i < 17 ; i++)

        {

            s = fib(next,prev);

            Console.WriteLine(s);

            prev = next;

            next = s;

        }

    }

}