using System;

public class Program

{

    public static void Main()

    {

        float initialInvestment = 20000;

        float yearlyInvestmentRatio = 1.3f;

        int numberOfYears = 9;

        float yearlyGains = 0.25f;

        float taxRate1 = 0.15f;

        float taxRate2 = 0.2f;

        float finalBalancePayingTaxesRightAway = 0;

        float finalBalancePayingTaxesAtTheEnd = 0;

        for (int experiment = 0; experiment < 2; experiment++)

        {

            bool payTaxesRightAway = experiment == 0;

            if (payTaxesRightAway)

            {

                Console.WriteLine("Pay taxes right away:"); 

            }

            else

            {

                Console.WriteLine("Pay taxes at the end:"); 

            }

            float totalInvestments = 0;

            float currentInvestment = initialInvestment;

            float currentBalance = 0;

            float gainsToTax = 0;

​

            for (int year = 0; year < numberOfYears; year++)

            {

                float gains = yearlyGains * currentBalance;

                float newBalance = currentBalance + gains;

​

                if (payTaxesRightAway)

                {

                    float taxes = taxRate1 * gains;

                    newBalance -= taxes;

​

                    Console.WriteLine($"Year {year} - Current balance: {currentBalance.ToString("n0")}. Gains: {gains.ToString("n0")}. Taxes: {taxes.ToString("n0")}. New balance: {newBalance.ToString("n0")}. Investment: {currentInvestment.ToString("n0")}");

                }

                else

                {

                    gainsToTax += gains;

                    Console.WriteLine($"Year {year} - Current balance: {currentBalance.ToString("n0")}. Gains: {gains.ToString("n0")}. New balance: {newBalance.ToString("n0")}. Investment: {currentInvestment.ToString("n0")}");

                }

                newBalance += currentInvestment;

                totalInvestments += currentInvestment;

                currentBalance = newBalance;

                currentInvestment *= yearlyInvestmentRatio;

            }

​

            if (gainsToTax > 0)

            {

                float finalTaxes = taxRate2 * gainsToTax;

                currentBalance -= finalTaxes;

                Console.WriteLine($"Final taxes: {finalTaxes.ToString("n0")}. Final balance: {currentBalance.ToString("n0")}");

            }

            if (payTaxesRightAway)

            {

                finalBalancePayingTaxesRightAway = currentBalance;

            }

            else

            {

                finalBalancePayingTaxesAtTheEnd = currentBalance;

            }

            float netGains = currentBalance - totalInvestments;

            Console.WriteLine($"Final balance: {currentBalance.ToString("n0")}. Total investments: {totalInvestments.ToString("n0")}. Net gains: {netGains.ToString("n0")}");

            Console.WriteLine();

        }

        if (finalBalancePayingTaxesRightAway > finalBalancePayingTaxesAtTheEnd) {

            Console.WriteLine($"You save {(finalBalancePayingTaxesRightAway - finalBalancePayingTaxesAtTheEnd).ToString("n0")} by paying taxes right away");

        }

        else

        {

            Console.WriteLine($"You save {(finalBalancePayingTaxesAtTheEnd - finalBalancePayingTaxesRightAway).ToString("n0")} by paying taxes at the end");

        }

    }

}