using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            double h = double.Parse(Console.ReadLine());
            double w = double.Parse(Console.ReadLine());
            double wInCm = w * 100;
            double hInCm = h * 100;

            double withoutCorridor = wInCm - 100;
            double seats = Math.Round(withoutCorridor / 70);
            double rows = Math.Round(hInCm / 120);
            double totalSeats = (seats * rows) - 3;

            Console.WriteLine(totalSeats);

        }
    }
}