using System;

namespace Mid_exam_10._19
{
    class Program
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine());
            int dailyPlunder = int.Parse(Console.ReadLine());
            double expectedPlunder = double.Parse(Console.ReadLine());


            double sumPlunder = 0;

            for (int currentDay = 1; currentDay <= days; currentDay++)
            {
                sumPlunder +=  dailyPlunder;

                if (currentDay % 3 == 0)
                {
                    sumPlunder += dailyPlunder * 0.5;
                }

                if (currentDay % 5 == 0)
                {
                    sumPlunder *= 0.70;
                }
            }

            if (sumPlunder >= expectedPlunder)
            {
                Console.WriteLine($"Ahoy! {sumPlunder:f2} plunder gained.");
            }

            else
            {
                double percentage = sumPlunder / expectedPlunder * 100;
                Console.WriteLine($"Collected only {percentage:f2}% of the plunder.");
            }




        }
    }
}