import java.util.Scanner;

public class SchoolHall {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        double hallLengthMeters = Double.parseDouble(scanner.nextLine());
        double hallWidthMeters = Double.parseDouble(scanner.nextLine());

        //int hlm = (int)hallLengthMeters;
        //int hwm = (int)hallWidthMeters;

        double hallAreaCm = (hallLengthMeters * 100) * (hallWidthMeters * 100);
        double corridorArea = 100 * (hallLengthMeters * 100);
        double freeAreaCm = hallAreaCm - corridorArea;

        int freeSpace = (int)freeAreaCm;

        int seat = 70 * 120;

        int seats = freeSpace/seat - 3;


        //int hallAreaCm = (hlm * 100) * (hwm * 100);
        //int workingPlaceCm = 70 * 120;
        //int corridorArea = 100 * (hlm * 100);

        //int columns = ((hlm * 100) - 100) / 70;
        //int rows = (hwm * 100) / 120;


        //int seats = columns * rows;


        //double freeArea = hallAreaCm - corridorArea;
        //double workingPlaces = freeArea/workingPlaceCm - 3;

        System.out.println(seats - 3);


    }
}