1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Text;
5. using System.Threading.Tasks;
6.  
7. namespace Fruit_shop
8. {
9.     class Program
10.     {
11.         static void Main(string[] args)
12.         {          
13.             string fruit = Console.ReadLine().ToLower();
14.             string day = Console.ReadLine().ToLower();
15.             double quantity = double.Parse(Console.ReadLine());
16.             double price = 0;
17.  
18. if (day == "monday" || day == "tuesday" || day == "thursday"
19.      || day == "friday"  || day == "wednesday" ) {
20.     if (fruit == "banana")
21.         price = 2.50 ;
22.     else if (fruit == "apple")
23.         price = 1.20 ;
24.     else if (fruit == "orange")
25.         price = 0.85 ;
26.     else if (fruit == "grapefruit")
27.         price = 1.45 ;
28.     else if (fruit == "kiwi")
29.         price = 2.70 ;
30.     else if (fruit == "pineapple")
31.         price = 5.50 ;
32.     else if (fruit == "grapes")
33.         price = 3.85;
34. }
35.  
36. else if (day == "saturday" || day == "sunday") {
37.     if (fruit == "banana")
38.         price = 2.70 ;
39.     else if (fruit == "apple")
40.         price = 1.25 ;
41.     else if (fruit == "orange")
42.         price = 0.90 ;
43.     else if (fruit == "grapefruit")
44.         price = 1.60 ;
45.     else if (fruit == "kiwi")
46.         price = 3.00 ;
47.     else if (fruit == "pineapple")
48.         price = 5.60 ;
49.     else if (fruit == "grapes")
50.         price = 4.20;
51. }
52.  
53. if (price > 0) {
54.     Console.WriteLine("{0:F2}", price * quantity);
55.     } else
56.     Console.WriteLine("error");
57.         }
58.     }
59. }