plant discovery

using System;
using System.Collections.Generic;
using System.Linq;

namespace zadacha
{
    class Program
    {
        static void Main(string[] args)
        {
            int times = int.Parse(Console.ReadLine());
            Dictionary<string, List<double>> rarity = new Dictionary<string, List<double>>();
            Dictionary<string, List<double>> rating = new Dictionary<string, List<double>>();

            for (int i = 0; i < times; i++)
            {
                string[] input = Console.ReadLine().Split("<->");

                //"{plant}<->{rarity}"

                rarity[input[0]] = new List<double>();
                rarity[input[0]].Add(double.Parse(input[1]));
                rating[input[0]] = new List<double>();
            }

            string[] command = Console.ReadLine().Split(": ");

            while (command[0] != "Exhibition")
            {
                string[] moreCommand = command[1].Split(" - ");

                if (command[0] == "Rate")
                {
                    //•   Rate: {plant} - {rating}
                    if (rating.ContainsKey(moreCommand[0]))
                    {
                        double number = double.Parse(moreCommand[1]);
                        rating[moreCommand[0]].Add(number);
                    }
                    else
                    {
                        Console.WriteLine("error");
                    }

                }
                else if (command[0] == "Update")
                {
                    //•   Update: {plant} - {new_rarity}
                    if (rarity.ContainsKey(moreCommand[0]))
                    {
                        rarity[moreCommand[0]].Clear();
                        rarity[moreCommand[0]].Add(double.Parse(moreCommand[1]));
                    }
                    else
                    {
                        Console.WriteLine("error");
                    }
                }
                else if (command[0] == "Reset")
                {
                    if (rating.ContainsKey(moreCommand[0]))
                    {
                        rating[moreCommand[0]].Clear();
                    }
                    else
                    {
                        Console.WriteLine("error");
                    }
                }
                else
                {
                    Console.WriteLine("error");
                }

                command = Console.ReadLine().Split(": ");
            }

            foreach (var item in rating)
            {
                double average = 0;
                if (item.Value.Count == 0)
                {
                    rarity[item.Key].Add(0);
                }
                else
                {
                    average = item.Value.Average();
                    rarity[item.Key].Add(average);
                }

            }

            Console.WriteLine("Plants for the exhibition:");

            foreach (var item in rarity.OrderByDescending(x=>x.Value[0]).ThenByDescending(x=>x.Value[1]))
            {
                Console.WriteLine($"- {item.Key}; Rarity: {item.Value[0]}; Rating: {item.Value[1]:F2}");
            }
        }
    }
}