package MidExamRetake;

import java.util.Scanner;

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

        int days = scanner.nextInt();
        int plunder = scanner.nextInt();
        double plunderTarget = scanner.nextDouble();

        double currentPlunder = 0;

        for (int i = 1; i <= days; i++) {
            currentPlunder += plunder;

            if (i % 3 == 0) {
                currentPlunder += 0.5 * plunder;
            }
            if (i % 5 == 0) {
                currentPlunder -= 0.3 * currentPlunder;
            }
        }


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