import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int d1 = sc.nextInt();
		double d2 = sc.nextInt();
		sc.close();

		if (d1 > d2) {
			System.out.println(0);
		} else if (d1 == d2) {
			System.out.println(4);
		} else if (d1 < d2 / 2) {
			System.out.println(0);
		} else if (d1 == d2 / 2) {
			System.out.println(4);
		} else {
			System.out.println(8);
		}
	}
}