Disneyland_Journey

using System;

namespace Disneyland_Journey
{
    class Program
    {
        static void Main(string[] args)
        {
            decimal jurneyCost = decimal.Parse(Console.ReadLine());
          int numMonths = int.Parse(Console.ReadLine());
            decimal monthSum = jurneyCost * 25/100;
           decimal totalSum = 0;
            decimal spentOdd = 0;
            decimal bonusFourhtMonth = 0;

            for (int i = 1; i <= numMonths; i++)
            {
                spentOdd = 0;
                bonusFourhtMonth = 0;
               if(i%4 == 0)
                {
                    bonusFourhtMonth += totalSum * 25/100;
                    totalSum += monthSum +bonusFourhtMonth;
                }
               else if(i%2 != 0 && i!=1)
                {
                    spentOdd -= totalSum * 16/100 ;
                    totalSum += (monthSum+spentOdd);
                }
                else
                {
                    totalSum += monthSum;
                }
            }
            decimal result = Math.Abs(jurneyCost - totalSum);
            if (totalSum >= jurneyCost)
            {
                Console.WriteLine($"Bravo! You can go to Disneyland and you will have {(result):F2}lv. for souvenirs.");
            }
            else
            {
                Console.WriteLine($"Sorry. You need {(result):f2}lv. more.");
            }
        }
    }
}