You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Nintendo_Entertainment_System

Context:
Subsequent plans to market a Famicom console in North America featuring a keyboard, cassette data recorder, wireless joystick controller and a special BASIC cartridge under the name "Nintendo Advanced Video System" likewise never materialized. By the beginning of 1985, the Famicom had sold more than 2.5 million units in Japan and Nintendo soon announced plans to release it in North America as the Advanced Video Entertainment System (AVS) that same year. The American video game press was skeptical that the console could have any success in the region, with the March 1985 issue of Electronic Games magazine stating that "the videogame market in America has virtually disappeared" and that "this could be a miscalculation on Nintendo's part."

Question:
How many units of the Famicom were sold in Japan by the beginning of 1985?

2.5 million units