Фото снимки; Photo Pictures

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)
        {
            var numPhotos = int.Parse(Console.ReadLine());
            var typePhotos = Console.ReadLine().ToLower();  //  "9X13" , "10X15" , "13X18" , "20X30"
            var orderType = Console.ReadLine().ToLower();   //  "online" , "office"

            double priceBGL = 0;

            if (typePhotos == "9x13")
            {
                priceBGL = numPhotos * 0.16;

                if (numPhotos >= 50)
                {
                    priceBGL = priceBGL * 0.95;
                }

            }
            else if (typePhotos == "10x15")
            {
                priceBGL = numPhotos * 0.16;

                if (numPhotos >= 80)
                {
                    priceBGL = priceBGL * 0.97;
                }
            }
            else if (typePhotos == "13x18")
            {
                priceBGL = numPhotos * 0.38;

                if (numPhotos >= 50  && numPhotos <= 100)
                {
                    priceBGL = priceBGL * 0.97;

                }
                else if (numPhotos > 100)
                {
                    priceBGL = priceBGL * 0.95;
                }
            }
            else if (typePhotos == "20x30")
            {
                priceBGL = numPhotos * 2.90;

                if (numPhotos >= 10 && numPhotos <= 50)
                {
                    priceBGL = priceBGL * 0.93;

                }
                else if (numPhotos > 50)
                {
                    priceBGL = priceBGL * 0.91;
                }
            }

            if (orderType == "online")
            {
                priceBGL = priceBGL * 0.98; // 2% online order
            }

            Console.WriteLine($"{priceBGL:f2}BGN");
        }
    }
}