FruitShop

using System;

namespace fruitStore
{
    class Program
    {
        static void Main(string[] args)
        {
            string fruit = Console.ReadLine();
            string day = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());
            double price = 0;
            if ((day == "Monday") || (day == "Tuesday") || (day == "Wednesday") || (day == "Thursday") || (day == "Friday"))
            {
                if (fruit == "banana") price = 2.50;

                else if (fruit == "apple") price = 1.20;

                else if (fruit == "orange") price = 0.85;

                else if (fruit == "grapefruit") price = 1.45;

                else if (fruit == "kiwi") price = 2.70;

                else if (fruit == "pineapple") price = 5.50;

                else if (fruit == "grapes") price = 3.85;

            }
            if ((day == "Saturday") || (day == "Sunday"))
            {
                if (fruit == "banana") price = 2.70;

                else if (fruit == "apple") price = 1.25;

                else if (fruit == "orange") price = 0.90;

                else if (fruit == "grapefruit") price = 1.60;

                else if (fruit == "kiwi") price = 3.00;

                else if (fruit == "pineapple") price = 5.60;

                else if (fruit == "grapes") price = 4.20;

            }
            if (price > 0)
                Console.WriteLine($"{quantity * price:F2}");
            else
            {
                Console.WriteLine("error");
            }
        }

    }

}