using System;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp18
{
    class Program
    {
        static void Main(string[] args)
        {
            double neededExperiance = double.Parse(Console.ReadLine());
            int countOfBattles = int.Parse(Console.ReadLine());

            double totalExperiance = 0;
            for (int i = 1; i <= countOfBattles; i++)
            {
                double experiancePerBattle = double.Parse(Console.ReadLine());
                totalExperiance += experiancePerBattle;
                if (i%3==0)
                {
                    totalExperiance += experiancePerBattle * 0.15;
                }
                if (i%5==0)
                {
                    totalExperiance -= experiancePerBattle * 0.1;
                }
                if (totalExperiance>=neededExperiance)
            {
                Console.WriteLine($"Player successfully collected his needed experience for {i} battles.");
                    break;
            }

            }
            if (totalExperiance<neededExperiance)
            {
                Console.WriteLine($"Player was not able to collect the needed experience, {(neededExperiance-totalExperiance):f2} more needed.");
            }

        }
    }
}