using System;

public class Program
{
    public static void Main()
    {
        int numberOfMonths = int.Parse(Console.ReadLine());
        int commissionInPercent = int.Parse(Console.ReadLine());
        double rent = double.Parse(Console.ReadLine());

        double firstMonthRent = Math.Floor((double)numberOfMonths / 2) * rent;
        double secondMonthRent = Math.Ceiling((double)numberOfMonths / 2) * rent * 4 / 5;
        double commission = (firstMonthRent + secondMonthRent) * commissionInPercent / 100;
        double grandTotal = firstMonthRent + secondMonthRent + commission;

        Console.WriteLine($"Total: {grandTotal:f2}");
    }
}