SchoolRoom

namespace _1000DaysAfterBirth
{
    using System;
    using System.Collections.Generic;
    using System.Globalization;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;

    public class Program
    {
        public static void Main()
        {
            double lenghtInMeters = double.Parse(Console.ReadLine());
            double widthInMeters = double.Parse(Console.ReadLine()) - 1;

            double lenghtInCantimeters = lenghtInMeters * 100;
            double rowsInRoom = Math.Floor(lenghtInCantimeters / 120.0);

            double widthInCantimeters = widthInMeters * 100;
            double workingPlacesOnRow = Math.Floor(widthInCantimeters / 70.0);

            double result = rowsInRoom * workingPlacesOnRow - 3;

            Console.WriteLine(result);
        }
    }
}