using System;

​

public class Program

{

    public static void Main()

    {

        double weight = 0, cost = 0;

        double overage = 0;

        int overage_Block = 0;

        double moddedAmount = 0;

        int choice = 0;

        Console.WriteLine("[1]First Class [2]Second Class : ");

        choice = int.Parse(Console.ReadLine());

        if (choice == 1)

        {

            Console.WriteLine("Enter the weight of the letter: ");

            weight = double.Parse(Console.ReadLine());

            if (weight <= 30)

            {

                cost = 0.38;

            }

            else if (weight > 30 && weight <= 50)

            {

                cost = 0.55;

            }

            else if (weight > 50 && weight <= 100)

            {

                cost = 0.73;

            }

            else

            {

                overage = weight - 100;

                Console.WriteLine(overage);

                overage_Block = (int)overage / 50;

                moddedAmount = overage % 50;

                if (moddedAmount > 0)

                {

                    overage_Block++;

                }

​

                cost = 0.73 + (overage_Block * 0.24);

                Console.WriteLine("Cost:  $" + cost);

            }

        }

        else

        {

            Console.WriteLine("Enter the weight of the letter: ");

            weight = double.Parse(Console.ReadLine());

            if (weight <= 30)

                cost = 0.28;

            else if (weight > 30 && weight <= 50)

            {

                cost = 0.40;

            }

            else if (weight > 50 && weight <= 100)

            {

                cost = 0.50;

            }

            else

            {

                overage = weight - 100;

                Console.WriteLine(overage);

                overage_Block = (int)overage / 50;

                moddedAmount = overage % 50;

                if (moddedAmount > 0)

                {

                    overage_Block++;

                }

​

                cost = 0.73 + (overage_Block * 0.19);

                Console.WriteLine("Cost:  $" + cost);

            }

        }

    }

}