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

class Car
{
    private List<Tyre> tyres;
    private Cargo cargo;
    private Engine engine;
    public double AveragePressure => tyres.Select(t => t.Pressure).Average();
    private string model;


    public Car(string model, Cargo cargo, Engine engine)
    {
        tyres = new List<Tyre>();
        this.Model = model;
        this.Cargo = cargo;
        this.Engine = engine;
    }

    public string Model
    {
        get { return model; }
        set { model = value; }
    }

    public Engine Engine
    {
        get { return engine; }
        set { engine = value; }
    }

    public List<Tyre> Tyres
    {
        get { return tyres; }
        set { tyres = value; }
    }

    public Cargo Cargo
    {
        get { return cargo; }
        set { cargo = value; }
    }

    public void AddTyre(Tyre tyre)
    {
        this.Tyres.Add(tyre);
    }
}