Given a reference text that provides the geographical description of continent Asia, how many Asian countries have a part of their land in Europe as well?

Context: Asia is the largest continent on Earth. It covers 9% of the Earth's total surface area, and has the longest coastline, at 62,800 kilometres. Asia is generally defined as comprising the eastern four-fifths of Eurasia. It is located to the east of the Suez Canal and the Ural Mountains, and south of the Caucasus Mountains and the Caspian and Black Seas. It is bounded on the east by the Pacific Ocean, on the south by the Indian Ocean and on the north by the Arctic Ocean. Asia is subdivided into 49 countries, five of them are transcontinental countries lying partly in Europe. Geographically, Russia is partly in Asia, but is considered a European nation, both culturally and politically.

Answer: 5