mobile operator

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading.Tasks;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            var DurationOfContract = Console.ReadLine();
            var TypeOfContract = Console.ReadLine();
            var AddedInternet = Console.ReadLine();
            int PayingMonths = int.Parse(Console.ReadLine());
            double price=0;
            if (DurationOfContract == "one")
            {
                if (TypeOfContract == "Small")
                {
                    if(AddedInternet=="yes")
                    {
                        price = (9.98 + 5.50) * PayingMonths;
                        Console.WriteLine("{0:f2} lv.",price);
                    }
                    else if (AddedInternet == "no")
                    {
                        price = 9.98 * PayingMonths;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                }
                else if (TypeOfContract == "Middle")
                {
                    if (AddedInternet == "yes")
                    {
                        price = (18.99 + 4.35) * PayingMonths;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                    else if (AddedInternet == "no")
                    {
                        price = 18.99 * PayingMonths;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                }
                else if (TypeOfContract == "Large")
                {
                    if (AddedInternet == "yes")
                    {
                        price = (25.98 + 4.35) * PayingMonths;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                    else if (AddedInternet == "no")
                    {
                        price = 25.98 * PayingMonths;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                }
                else if (TypeOfContract == "ExtraLarge")
                {
                    if (AddedInternet == "yes")
                    {
                        price= (35.99 + 3.85) * PayingMonths;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                    else if (AddedInternet == "no")
                    {
                        price = 35.99 * PayingMonths;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                }
            }
            if (DurationOfContract == "two")
            {
                if (TypeOfContract == "Small")
                {
                    if(AddedInternet == "yes")
                    {
                        price = (8.58+5.50)* PayingMonths;
                        price = price - price * 0.0375;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                    else if (AddedInternet == "no")
                    {
                        price= 8.58 * PayingMonths;
                        price = price - price * 0.0375;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                }
                else if (TypeOfContract == "Middle")
                {
                    if (AddedInternet == "yes")
                    {
                        price = (17.09+4.35)* PayingMonths;
                        price = price - price * 0.0375;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                    else if (AddedInternet == "no")
                    {
                        price = 17.09 * PayingMonths;
                        price= price - price * 0.0375;
                        Console.WriteLine("{0:f2} lv.", price);
                    }

                }
                else if (TypeOfContract == "Large")
                {
                    if (AddedInternet == "yes")
                    {
                        price= (23.59+4.35) * PayingMonths;
                        price = price - price * 0.0375;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                    else if (AddedInternet == "no")
                    {
                        price = 23.59 * PayingMonths;
                        price= price - price * 0.0375;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                }
                else if (TypeOfContract == "ExtraLarge")
                {
                    if (AddedInternet == "yes")
                    {
                        price= (31.79+3.85) * PayingMonths;
                        price = price - price * 0.0375;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                    else if (AddedInternet == "no")
                    {
                        price = 31.79 * PayingMonths;
                        price = price - price * 0.0375;
                        Console.WriteLine("{0:f2} lv.", price);
                    }
                }
            }
        }
    }
}