Contribution #770

Problem: ru/2.7.15

Added 2.7.15 2.7.16 2.7.17

Editor: Aliaksandr Melnichenka ( @astrosander )

Time: December 15, 2023 at 10:59 AM

GitHub commit: 183d75d81963d437c65172cd1d9e223ee239685a

+174 -0 lines changed