TheBlackFlag

using System;

namespace _01._BlackFLag
{
    class BlackFlag
    {
        static void Main(string[] args)
        {
            int daysPirating = int.Parse(Console.ReadLine());
            int plunderForDay = int.Parse(Console.ReadLine());
            double expectedPlunder = double.Parse(Console.ReadLine());


            double plunder = 0;
            for (int i = 1; i <= daysPirating; i++)
            {
                if (i % 3 == 0)
                {
                    double plunderTheThirdDay = plunderForDay * 1.50;

                    plunder += plunderTheThirdDay;
                }

                else
                {
                    plunder += plunderForDay;

                }

                if (i % 5 == 0)
                {
                    plunder *= 0.70;
                }

            }

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