Задания 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9
Merge pull request #2 from k-shym/hw2_k_shum

Задания 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9