using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("EQ: y=y_0(e^rt)");

        Console.WriteLine("Enter d or h");

        if (Console.ReadLine() == "d")

        {

            Console.WriteLine("EQ: 2y_0=y_0(e^rt)");

            Console.WriteLine("EQ: 2=(e^rt)");

            Console.WriteLine("Enter r.");

            double r = double.Parse(Console.ReadLine());

            Console.WriteLine("FINAL: 2 = e^(" + r + "t)");

        }

        else

        {

            Console.WriteLine("EQ: 1/2y_0=y_0(e^rt)");

            Console.WriteLine("EQ: 1/2=(e^rt)");

            Console.WriteLine("Enter r.");

            double r = double.Parse(Console.ReadLine());

            Console.WriteLine("FINAL: 1/2 = e^(" + r + "t)");

        }

    }

}