import java.util.Scanner;

public class ClassRoom {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        double hallLenght = Double.parseDouble(scan.nextLine());
        double hallWidht = Double.parseDouble(scan.nextLine());

        double clearHallWidth = (hallWidht * 100) - 100; //with out the hallWay
        double places = clearHallWidth / 70; // Deviding the hallWIdth by the TableWith

        double linesWithPlaces = (hallLenght * 100) / 120;

        double overallWorkPlaces = (places * linesWithPlaces) - 3;
        System.out.printf("%.0f", overallWorkPlaces);














    }
}