using System;

public class Program

{

    public static void Main()

    {

        int a = 0, b = 1, c;

        for(int i=0; i < 20; i++)

        {

            c = a + b;

            Console.Write(c + (i != 19 ? ", " : ""));

            a = b;

            b = c;

        }

    }

}