package com.company;

import java.util.*;

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        int days = Integer.parseInt(scanner.nextLine());
        double dailyBounty = Double.parseDouble(scanner.nextLine());
        double target = Double.parseDouble(scanner.nextLine());

        double booty = 0;
        for (int i = 1; i <= days; i++) {

            booty += dailyBounty;
            if (i % 3 == 0) {
                booty += (dailyBounty * 0.5);
            } else if (i % 5 == 0) {
                booty -= 0.3 * booty;
            }
        }

        if (booty >= target) {
            System.out.printf("Ahoy! %.2f plunder gained.", booty);
        } else {

            double procentPlunder = (booty / target) * 100;
            System.out.printf("Collected only %.2f%% of the plunder.", procentPlunder);
        }

    }
}