static pole

using System;

public class Program
{
	public static void Main()
	{
		Car car1 = new Car();
		Car car2 = new Car();
		Car car3 = new Car();
		Car car4 = new Car();
		Car.brand = "BMW";
		Console.WriteLine(Car.brand);
		Car.SetBrand();
		Console.WriteLine(Car.brand);
	}
}

class Car
{

	public static string brand;
	string model;
	double price;

	public Car(string model, double price)
	{
		this.model = model;
		this.price = price;
	}
	public Car()
	{
		this.model = "astra";
		this.price = 17000;
	}
	public static void SetBrand()
	{
		brand = "Lada";
	}
}