using System;

namespace _01._Black_Flag
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine());
            int dailyPlunder = int.Parse(Console.ReadLine());
            double expectedPlunder = int.Parse(Console.ReadLine());
            double curentPlunder = 0;
            double percent = 0;

            for (int i = 1; i <= days; i++)
            {
                if (i % 3 == 0)
                {
                    curentPlunder += 1.5 * dailyPlunder;
                }
                else if (i % 5 == 0)
                {
                    curentPlunder += dailyPlunder;
                    curentPlunder *= 0.7;
                }
                else
                {
                    curentPlunder += dailyPlunder;
                }
            }

            percent = (curentPlunder / expectedPlunder) * 100;

            if (expectedPlunder <= curentPlunder)
            {
                Console.WriteLine($"Ahoy! {curentPlunder:f2} plunder gained.");
            }
            else
            {
                Console.WriteLine($"Collected only {percent:f2}% of the plunder.");
            }


        }
    }
}