import java.util.Scanner;

public class KUR {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        double depositSum = Double.parseDouble(sc.nextLine());
        int srok = Integer.parseInt(sc.nextLine());
        double procent = Double.parseDouble(sc.nextLine());

        double stackedInterest = (depositSum*(procent/100.0f));
        double interestForOneMoth = stackedInterest / 12;
        double totalSum = depositSum + srok * interestForOneMoth;

        System.out.println(totalSum);
    }
}