using System;

namespace Uchebna_Zala
{
    class Program
    {
        static void Main(string[] args)
        {
           double lenght = double.Parse(Console.ReadLine());
            double width = double.Parse(Console.ReadLine());
            double cols = Math.Truncate(((width * 100) - 100) / 70);
            double rows = Math.Truncate((lenght * 100) / 120);
            double seats = cols * rows - 3;
            Console.WriteLine(Math.Truncate(seats));
        }
    }
}