решить все примеры.
https://sun9-23.userapi.com/impf/8pMPcw3Pt7ZVnshDOVHrgyG3_6HfBi2f0JwQuQ/xj10uRCdYqQ.jpg?size=618x1141&quality=95&sign=09fbdceb501e80b59cd39ab4f1e3a7f9&type=album