01. Counter-Strike

using System;

namespace CounterStrike
{
    class Program
    {
        static void Main(string[] args)
        {
            int energy = int.Parse(Console.ReadLine());
            int count = 0, battleIndex;

            string command;

            while ((command = Console.ReadLine()) != "End of battle")
            {
                battleIndex = int.Parse(command);
                if (energy < battleIndex)
                {
                    break;
                }
                count++;
                if (count % 3 == 0)
                {
                    energy += count;
                }
                energy -= battleIndex;
            }

            if (command == "End of battle")
            {
                Console.WriteLine($"Won battles: {count}. Energy left: {energy}");
            }
            else
            {
                Console.WriteLine($"Not enough energy! Game ends with {count} won battles and {energy} energy");
            }
        }
    }
}