using System;

namespace Deposit_Calculator
{
    class Program
    {
        static void Main(string[] args)
        {
            double depositAmount = double.Parse(Console.ReadLine());
            double termDepositMonths = double.Parse(Console.ReadLine());
            double yearPercent = double.Parse(Console.ReadLine());

            double Amount = depositAmount + termDepositMonths * ((depositAmount * yearPercent) / 12);
            Console.WriteLine($"{Amount:f2}");
        }
    }
}