using System;

public class Program

{

    public static void Main()

    { 

        int a = 0, b = 1, c,  n;

        n=6;

        Console.WriteLine("fibonacci series");

        Console.WriteLine(a+" "+b+" ");

        for(int i=2;i<n;i++)

        {

            c=a+b;

            Console.WriteLine(c);

            a=b;

            b=c;

        }

    }

}