import java.util.Map;
import java.util.Scanner;

public class Demo {
    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 * 100) - 100) / 70);
        double rows = Math.floor((l * 100) / 120);

        double workSpaces = columns * rows - 3;

        System.out.println(Math.round(workSpaces));
    }
}