using System;
class Program
{
    static void Main()
    {
        int workDaysInMonth = int.Parse(Console.ReadLine());
        double moneyMakedForTheDay = double.Parse(Console.ReadLine());
        double USDToLEV = double.Parse(Console.ReadLine());

        double monthSalary = workDaysInMonth * moneyMakedForTheDay;
        double yearSalary = monthSalary * 12 + monthSalary * 2.5;
        double taxes = 0.75 * yearSalary * USDToLEV / 365;

        Console.WriteLine("{0:F2}", taxes);
    }
}