using System;
using System.Linq.Expressions;

namespace Add_Bags
{
    class Program
    {
        static void Main(string[] args)
        {
            int hight = int.Parse(Console.ReadLine());
            int length = int.Parse(Console.ReadLine());
            int percentage = int.Parse(Console.ReadLine());

            const int walls = 4;
            double totalCover = 0;
            int count = 0;

            totalCover = hight * length * walls;
            totalCover -= totalCover * (percentage * 0.01);



            while (true)
            {
                string line = Console.ReadLine();
                count = int.Parse(line);

                if (line == "Tired!")
                {
                    break;
                }


                totalCover -= count;


            }
            Console.WriteLine(totalCover);
        }
        }
    }