import java.util.Scanner;

public class E06BlackFlag1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int countDays = Integer.parseInt(scanner.nextLine());
        int plunderPerDay = Integer.parseInt(scanner.nextLine());
        double expectedPlunder = Double.parseDouble(scanner.nextLine());

        double sumPlunder = 0;
        double additional = plunderPerDay * 0.5;

        for (int days = 1; days <= countDays; days++) {
            sumPlunder += plunderPerDay;

            if (days % 3 == 0) {
                sumPlunder += additional;
            }

            if (days % 5 == 0) {
                sumPlunder *= 0.7;
            }
        }

        if (sumPlunder >= expectedPlunder) {
            System.out.printf("Ahoy! %.2f plunder gained.", sumPlunder);
        } else {
            System.out.printf("Collected only %.2f%% of the plunder.", sumPlunder / expectedPlunder * 100);
        }
    }
}