using System;

​

public class Program

{

    public class Car

    {

        private int Speed;

        private string Make;

        private string Model;

        private int Year;

        public Car(string make, string model, int year, int speed)

        {

            this.Make = make;

            this.Model = model;

            this.Year = year;

            this.Speed = speed;

        }

​

        public Car(string make, string model, int year)

        {

            this.Make = make;

            this.Model = model;

            this.Year = year;

            this.Speed = 0;

        }

​

        public int SpeedUp()

        {

            this.Speed = ++Speed;

            return (Speed);

        }

​

        public int SlowDown()

        {

            if (Speed > 0)

            {

                this.Speed = --Speed;

            }

​

            return (Speed);

        }

​

        public void Display()

        {

            Console.WriteLine(Year + " " + Make + " " + Model + " is going " + Speed + " MPH.");

        //Convert.ToString(Console.ReadLine());

        }

    }

​

    public static void Main()

    {

        {

            int car1Speed = 20;

            int car2Speed = 0;

            Car car1 = new Car("Ford", "Focus", 2010, car1Speed);

            Car car2 = new Car("Chevy", "Cruze", 2018, car2Speed);

            for (int i = 0; i < 60; i++)

            {

                if (i % 2 == 0)

                {

                    car2Speed = car2.SpeedUp();

                }

​

                if (i % 3 == 0)

                {

                    car1Speed = car1.SpeedUp();

                }

​

                if (i % 5 == 0)

                {

                    car1Speed = car1.SlowDown();

                    car2Speed = car2.SlowDown();

                }

            }

​

            car1.Display();

            car2.Display();

        }

    }

}