spring vacantion trip

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading;

namespace ConsoleApp1
{
    class Exam
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine());
            double budget = double.Parse(Console.ReadLine());
            int groupPeople = int.Parse(Console.ReadLine());
            double fuelPerKm = double.Parse(Console.ReadLine());
            double foodPerDay = double.Parse(Console.ReadLine());
            double roomPerPerson = double.Parse(Console.ReadLine());

            double fullExpence = 0;

            if (groupPeople > 10)
            {
                fullExpence = (days * foodPerDay * groupPeople) + ((days * roomPerPerson * groupPeople) * 0.75);
            }
            else
            {
                fullExpence = (days * foodPerDay * groupPeople) + (days * roomPerPerson * groupPeople);
            }

            for (int i = 1; i <= days; i++)
            {
                double distance = double.Parse(Console.ReadLine());

                fullExpence += distance * fuelPerKm;

                if (i % 3 == 0 || i % 5 == 0)
                {
                    fullExpence += fullExpence * 0.40;
                }
                if (i % 7 == 0)
                {
                    fullExpence -= fullExpence / groupPeople;
                }
                if (budget < fullExpence)
                {
                    Console.WriteLine($"Not enough money to continue the trip. You need {fullExpence - budget:f2}$ more.");
                    break;
                }
            }

            if (budget >= fullExpence)
            {
                Console.WriteLine($"You have reached the destination. You have {budget - fullExpence:F2}$ budget left.");
            }
        }
    }
}