import java.util.Scanner;

public class Rent {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int months = Integer.parseInt(sc.nextLine());
        int percent = Integer.parseInt(sc.nextLine());
        double priceRentMonth = Double.parseDouble(sc.nextLine());

        double totalPrice = 0;


        double priceSecondHalf = 0;
        double priceFirstHalf = 0;

        if (months % 2 == 0) {
            priceFirstHalf = priceRentMonth * (months * 1.0 / 2);
            priceSecondHalf = (priceRentMonth - priceRentMonth * 0.2) * (months * 1.0 / 2);
        } else {
            priceFirstHalf = priceRentMonth * months / 2;
            priceSecondHalf = (priceRentMonth - priceRentMonth * 0.2)  * Math.round(months * 1.0 / 2);
        }

        totalPrice = priceFirstHalf + priceSecondHalf;
        totalPrice += totalPrice * (percent * 1.0 / 100);
        System.out.printf("Total: %.2f", totalPrice);
    }
}