\*
using System;

namespace Fruit_Shop
{
    class Program
    {
        static void Main()	//  е това решение много ми харесва!... От колега е!... Браво ;) !
        {
            string fruit = Console.ReadLine();
            string day = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());

            double price = 0.0;

            if (day == "Monday" ||
                day == "Tuesday" ||
                day == "Wednesday" ||
                day == "Thursday" ||
                day == "Friday")
            {
                if (fruit == "banana")
                {
                    price = quantity * 2.5;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "apple")
                {
                    price = quantity * 1.2;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "orange")
                {
                    price = quantity * 0.85;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "grapeFruit")
                {
                    price = quantity * 1.45;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "kiwi")
                {
                    price = quantity * 2.7;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "pineapple")
                {
                    price = quantity * 5.5;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "grapes")
                {
                    price = quantity * 3.85;
                    Console.WriteLine($"{price:f2}");
                }
                else
                {
                    Console.WriteLine("error");
                }
            }
            else if (day == "Sunday" || day == "Saturday")
            {
                if (fruit == "banana")
                {
                    price = quantity * 2.7;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "apple")
                {
                    price = quantity * 1.25;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "orange")
                {
                    price = quantity * 0.9;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "grapefruit")
                {
                    price = quantity * 1.6;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "kiwi")
                {
                    price = quantity * 3.0;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "pineapple")
                {
                    price = quantity * 5.60;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "grapes")
                {
                    price = quantity * 4.2;
                    Console.WriteLine($"{price:f2}");
                }
                else
                {
                    Console.WriteLine("error");
                }
            }
            else
            {
                    Console.WriteLine("error");
            }
        }
    }
}



*\
using System;

namespace Fruit_Shop
{
    class Program
    {
        static void Main()
        {
            string fruit = Console.ReadLine();
            string day = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());

            double price = 0.0;

            if (day == "Monday" ||
                day == "Tuesday" ||
                day == "Wednesday" ||
                day == "Thursday" ||
                day == "Friday")
            {
                if (fruit == "banana")
                {
                    price = quantity * 2.5;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "apple")
                {
                    price = quantity * 1.2;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "orange")
                {
                    price = quantity * 0.85;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "grapeFruit")
                {
                    price = quantity * 1.45;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "kiwi")
                {
                    price = quantity * 2.7;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "pineapple")
                {
                    price = quantity * 5.5;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "grapes")
                {
                    price = quantity * 3.85;
                    Console.WriteLine($"{price:f2}");
                }
                else
                {
                    Console.WriteLine("error");
                }
            }
            else if (day == "Sunday" || day == "Saturday")
            {
                if (fruit == "banana")
                {
                    price = quantity * 2.7;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "apple")
                {
                    price = quantity * 1.25;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "orange")
                {
                    price = quantity * 0.9;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "grapefruit")
                {
                    price = quantity * 1.6;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "kiwi")
                {
                    price = quantity * 3.0;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "pineapple")
                {
                    price = quantity * 5.60;
                    Console.WriteLine($"{price:f2}");
                }
                else if (fruit == "grapes")
                {
                    price = quantity * 4.2;
                    Console.WriteLine($"{price:f2}");
                }
                else
                {
                    Console.WriteLine("error");
                }
            }
            else
            {
                    Console.WriteLine("error");
            }
        }
    }
}