Contribution #520

Problem: ru/5.3.4

Added 5.3.1 5.3.2 5.3.3 5.3.4 5.3.5 5.3.14

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: November 7, 2023 at 09:53 PM

GitHub commit: b5dd549c795bed9c767ee07b25d7d6b85677a908

+236 -49 lines changed