using System;

using System.Collections.Generic;

public class Program

{

    public static Dictionary<int, int> menu = new Dictionary<int, int>();

    /*public static void SuggestLunch (Dictionary<int, int> lunchMenu){

        int max = 0;

        int index = 0;

        foreach (KeyValuePair<int, int> x in menu){

            if (x.Value > max)

                max = x.Value;

        }

    }*/

    public static void Main()

    {

        Random random = new Random(1);    

        int item = 0;

        int count = 0;

        int orderInt = 0;

        for(int i = 0; i < 5; i++){

            item = random.Next(1, 11);

            count = random.Next(1, 11);

            if(!menu.ContainsKey(item))

                menu.Add(item, count);

        }

        int max = 0;

        int maxlunch = 0;

        List<int> NoLunch = new List<int>();

        while (true) {

            foreach (KeyValuePair<int, int> x in menu){

                if(x.Value > max){

                    max = x.Value;

                    maxlunch = x.Key;

                }

            }

        /*  for (int i = 1; i < 11; i++){

                if(!menu.ContainsKey(i))

                    NoLunch.Add(i);

            }*/

            //foreach (KeyValuePair<int, int> x in menu){

            //  if(x.Value <= 0)

            //      NoLunch.Add(x.Key);

            //}

            Console.WriteLine("We are now having:");

            foreach (KeyValuePair<int, int> x in menu){

                Console.WriteLine("Lunch {0}, Count = {1}", x.Key, x.Value);

            }

            Console.WriteLine("Please enter a lunch number:");

            string order = Console.ReadLine();

            bool success = int.TryParse(order, out orderInt); // The input is a number

        if ((orderInt >= 1 && orderInt <= 10) && success){

            if (menu.ContainsKey(orderInt) && menu[orderInt] > 0) {

                Console.WriteLine("You get a lunch {0}! Currently we do not have the following lunches:", orderInt);

                menu[orderInt]--;

                for (int i = 1; i < 11; i++){

                    if (!menu.ContainsKey(i) || menu[i] <=0)

                        Console.WriteLine("Lunch {0}", i);

                }

            }

            else

                Console.WriteLine("We do not have lunch {0} now. Would you like to try lunch {1}?", orderInt, maxlunch);

        }

        else {

            Console.WriteLine("It is not a valid lunch number.");

            break;

        }

    }

    }

}

​