Definition: In this task, you are given a text which is the body of a document. Your job is to classify the topic of the document into these categories: 1)Company, 2)Educational Institution, 3)Artist, 4)Athlete, 5)Office Holder, 6)Mean of transportation, 7)Building, 8)Natural place, 9)Village, 10)Animal, 11)Plant, 12)Album, 13)Film, 14)Written work. Your output should be the category number. Don't generate anything apart from numbers 1-14.
Input: Text:  The Luan River (Chinese: 滦河; pinyin: Luánhé formerly known as Lei Shui or Ru Shui) is a river in China. It flows northwards from its source in the province of Hebei into the province of Inner Mongolia and then flows southeast back into Hebei to its mouth on the Bohai Sea. The headstream of the river is known as Shandian River. This part of the river flows near the ancient Mongol capital city of Shangdu. Another important settlement in this section of the river is Duolun.

8