using System;

public class Program

{

    public static void Main()

    {

        double term1 = 2;

        double term2 = 3;

        Console.WriteLine(term1);

        Console.WriteLine(term2);

        for(double i=1; i<=30; i=i+1)

        {

            term1 = term2 + (2 * term1);

                Console.WriteLine(term1);

            term2 = term1 + (2 * term2);

                Console.WriteLine(term2);

        }

    }

}