import java.util.Scanner;

public class P03102021УПР3 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner (System.in);

        double deposit = Double.parseDouble(scanner.nextLine());
        int months = Integer.parseInt(scanner.nextLine());
        double lihva = Double.parseDouble(scanner.nextLine());
        double sum = deposit+months*((deposit*lihva*0.01)/12);
        System.out.println(sum);

    }
}