using System;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine());

            short daily = short.Parse(Console.ReadLine());

            float expectation = float.Parse(Console.ReadLine());

            float plunder = 0;

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

                if (i % 3 == 0)
                {
                    plunder += (daily / 2);
                }
                if (i % 5 == 0)
                {
                    plunder -= (plunder / 10) * 3;
                }
            }

            if (plunder >= expectation)
            {
                Console.WriteLine($"Ahoy! {string.Format("{0:0.00}", plunder)} plunder gained.");
            }
            else
            {
                Console.WriteLine($"Collected only {string.Format("{0:0.00}", (plunder /expectation)*100)}% of the plunder.");
            }
        }
    }
}