FruitShop

using System;

namespace Statements
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            string fruit = Console.ReadLine().ToLower();
            string day = Console.ReadLine().ToLower();
            var ammount = double.Parse(Console.ReadLine());

            bool dayIsNotWeekend = day != "sunday" && day != "saturday";
            double price = -1.0;

            if (fruit == "banana")
            {
                price = dayIsNotWeekend ? 2.50 : 2.70;
            }
            else if (fruit == "apple")
            {
                price = dayIsNotWeekend ? 1.20 : 1.25;
            }
            else if (fruit == "orange")
            {
                price = dayIsNotWeekend ? 0.85 : 0.9;
            }
            else if (fruit == "grapefruit")
            {
                price = dayIsNotWeekend ? 1.45 : 1.60;
            }
            else if (fruit == "kiwi")
            {
                price = dayIsNotWeekend ? 2.70 : 3.00;
            }
            else if (fruit == "pineapple")
            {
                price = dayIsNotWeekend ? 5.50 : 5.60;
            }
            else if (fruit == "grapes")
            {
                price = dayIsNotWeekend ? 3.85 : 4.20;
            }

            double result = ammount * price;


            if ((day == "monday" ||
                 day == "tuesday" ||
                 day == "wednesday" ||
                 day == "thursday" ||
                 day == "friday" ||
                 day == "saturday" ||
                 day == "sunday") &&
                 result >= 0)
            {
                Console.WriteLine(Math.Round(result, 2));
            }
            else
            {
                Console.WriteLine("error");
            }

        }
    }
}