01. Counter Strike (MarinaD)

initial_energy = int(input())
command = input()
wins = 0

while not command == 'End of battle':
    if initial_energy - int(command) >= 0:
        initial_energy -= int(command)
        wins += 1
        if wins % 3 == 0:
            initial_energy += wins
    else:
        print(f'Not enough energy! Game ends with {wins} won battles and {initial_energy} energy')
        exit()
    command = input()

print(f'Won battles: {wins}. Energy left: {initial_energy}')