using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace _1_6
{
    internal class Program
    {
        static void Main(string[] args)
        {
            double price, total;
            Console.WriteLine("******************************");
            Console.WriteLine("       Program Telaphone      ");
            Console.WriteLine("******************************");
            // Input customer details
            Console.Write("phone number: ");
            string phoneNumber = Console.ReadLine();
 
            Console.Write("Enter  name: ");
            string customerName = Console.ReadLine();
 
            Console.Write("minutes: ");
            int minutes = int.Parse(Console.ReadLine());
 
            // Variable to store the total phone bill
            double totalCost = 0.0;
 
            // Calculate phone bill based on conditions
            if (minutes <= 3)
            {
                totalCost = minutes * 3.0; // First 1-3 minutes: 3.0 per minute
            }
            else if (minutes <= 6)
            {
                totalCost = (3 * 3.0) + ((minutes - 3) * 2.0); // Next 4-6 minutes: 2.0 per minute
            }
            else if (minutes <= 11)
            {
                totalCost = (3 * 3.0) + (3 * 2.0) + ((minutes - 6) * 1.0); // Next 7-11 minutes: 1.0 per minute
            }
            else
            {
                totalCost = (3 * 3.0) + (3 * 2.0) + (5 * 1.0) + ((minutes - 11) * 0.5); // Over 11 minutes: 0.5 per minute
            }
 
            // Calculate tax (7%)
            double tax = totalCost * 0.07;
 
            // Calculate total amount including tax
            double totalWithTax = totalCost + tax;
 
            // Display the result
            Console.WriteLine("\n===== Phone Bill =====");
            Console.WriteLine("Phone Number: " + phoneNumber);
            Console.WriteLine("Customer Name: " + customerName);
            Console.WriteLine("Minutes Used: " + minutes + " minutes");
            Console.WriteLine("Phone Bill: " + totalCost.ToString("F2") + " THB");
            Console.WriteLine("Tax (7%): " + tax.ToString("F2") + " THB");
            Console.WriteLine("Total Amount: " + totalWithTax.ToString("F2") + " THB");
 
        }
    }
}
 
 

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