StudyHall

import java.util.Scanner;

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

        double l = Double.parseDouble(scanner.nextLine());
        double w = Double.parseDouble(scanner.nextLine());


        double columns = Math.floor((w - 1) / 70);
        double rows = Math.floor(l / 1.2);

        double all = columns * rows;

        double seats = all - 3;

        System.out.println(Math.floor(seats));
    }
}