Task: Text Categorization
Input (English): 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.
Output (English): 8