Dragon Army

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

class DragonArmy
{
    static void Main(string[] args)
    {
        int count = int.Parse(Console.ReadLine());

        var dragons = new Dictionary<string, Dictionary<string, Dragon>>();

        for (int currentDragon = 0; currentDragon < count; currentDragon++)
        {
            string[] input = Console.ReadLine()
                .Split()
                .ToArray();

            string type = input[0];
            string name = input[1];
            string damage = input[2];
            string health = input[3];
            string armor = input[4];

            if (dragons.ContainsKey(type) == false)
            {
                dragons.Add(type, new Dictionary<string, Dragon>());
            }

            Dragon dragon = new Dragon(damage, health, armor);

            dragons[type][name] = dragon;
        }

        foreach (var type in dragons)
        {
            double averageDamage = type.Value.Values.Average(x => x.Damage);
            double averageHealth = type.Value.Values.Average(x => x.Health);
            double averageArmor = type.Value.Values.Average(x => x.Armor);

            Console.WriteLine($"{type.Key}::({averageDamage:F2}/{averageHealth:F2}/{averageArmor:F2})");

            foreach (var name in type.Value.OrderBy(x => x.Key))
            {
                Console.WriteLine($"-{name.Key} -> damage: {name.Value.Damage}, health: {name.Value.Health}, armor: {name.Value.Armor}");
            }
        }
    }
}

class Dragon
{
    private const int defaultDamage = 45;
    private const int defaultHealth = 250;
    private const int defaultArmor = 10;
    public Dragon(string damage, string health, string armor)
    {
        this.Damage =  damage == "null" ? defaultDamage : int.Parse(damage);
        this.Health = health == "null" ? defaultHealth : int.Parse(health);
        this.Armor = armor == "null" ? defaultArmor : int.Parse(armor);
    }

    public int Damage { get; }
    public int Health { get; }
    public int Armor { get; }
}