CounterStrike

using System;

namespace CounterStrike
{
    class MainClass
    {
        public static void Main()
        {
            int energy = int.Parse(Console.ReadLine());
            int countOfBattles = 0;

            string command = string.Empty;
            while((command=Console.ReadLine())!="End of battle")
            {
                int distanceEqualToEnergy = int.Parse(command);
                if (energy >= distanceEqualToEnergy)
                {
                    energy -= distanceEqualToEnergy;
                    countOfBattles++;
                }

               else if (energy < distanceEqualToEnergy)
                {
                    Console.WriteLine($"Not enough energy! Game ends with {countOfBattles} won battles and {energy} energy");
                    return;
                }

                if (countOfBattles % 3 == 0)
                {
                    energy += countOfBattles;
                }
            }

            Console.WriteLine($"Won battles: {countOfBattles}. Energy left: {energy}");
        }
      }
    }