07. Fruit Shop

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FruitShop
{
    class Program
    {
        static void Main(string[] args)
        {
            var fruit = Console.ReadLine().ToLower();
            var day = Console.ReadLine().ToLower();
            var quantity = double.Parse(Console.ReadLine());

            if(day =="monday"||day=="tuesday"||day=="wednesday"||day=="thursday"||day=="friday")
            {
                if (fruit == "banana")
                {
                    quantity *= 2.5;
                }
                else if (fruit == "apple")
                {
                    quantity *=1.2;
                }
                else if (fruit == "orange")
                {
                    quantity*=0.85;
                }

                else if (fruit == "grapefruit")
                {
                    quantity*=1.45;
                }
                else if (fruit == "kiwi")
                {
                    quantity*=2.7;
                }
                else if(fruit=="pineapple")
                {
                    quantity*=5.5;
                }
                else if(fruit=="grapes")
                {
                    quantity*=3.85;
                }
                if (quantity >= 0)
                    Console.WriteLine("{0:f2}", quantity);
                else
                    Console.WriteLine("error");

            }
            else
            {
                Console.WriteLine("error");
            }
            if(day=="saturday"||day=="sunday")
            {
                if (fruit == "banana")
                {
                    quantity *=2.7;
                }
                else if (fruit == "apple")

                {
                    quantity*=1.25;
                }
                else if (fruit == "orange")
                {
                    quantity*=0.9;
                }
                else if (fruit == "grapefruit")
                {
                    quantity*=1.6;
                }
                else if (fruit == "kiwi")
                {
                    quantity*=3;
                }
                else if (fruit == "pineapple")
                {
                    quantity*=5.60;
                }
                else if (fruit == "grapes")
                {
                    quantity*=4.20;
                }
                if(quantity>=0)
                    Console.WriteLine("{0:f2}",quantity);
                else
                    Console.WriteLine("error");
            }
            else
            {
                Console.WriteLine("error");
            }
        }

    }
}