Background: Octavia Estelle Butler was born on June 22, 1947, in Pasadena, California, the only child of Octavia Margaret Guy, a housemaid, and Laurice James Butler, a shoeshine man. Butler's father died when she was seven, so Octavia was raised by her mother and maternal grandmother in what she would later recall as a strict Baptist environment. Growing up in the racially integrated community of Pasadena allowed Butler to experience cultural and ethnic diversity in the midst of racial segregation. She accompanied her mother to her cleaning work, where the two entered white people's houses through back doors, as workers.
Context: In the mid-1990s, Butler published two novels later designated as the Parable (or Earthseed) series. The books depict the struggle of the Earthseed community to survive the socioeconomic and political collapse of twenty-first century America due to poor environmental stewardship, corporate greed, and the growing gap between the wealthy and the poor. The books propose alternate philosophical views and religious interventions as solutions to such dilemmas.  The first book in the series, Parable of the Sower (1993), features a fifteen-year-old protagonist named Lauren Oya Olamina, and is set in a dystopian California in the 2020s. Lauren, who suffers from a syndrome causing her to literally feel any physical pain she witnesses, decides to escape the corruption and corporatization of her community of Robledo. She forms a new belief system, Earthseed, in order to prepare for the future of the human race on another planet. Recruiting members of varying social backgrounds, Lauren relocates her new group to Northern California, naming her new community "Earthseed".  Her 1998 follow-up novel, Parable of the Talents, is set sometime after Lauren's death and is told through the excerpts of Lauren's journals as framed by the commentary of her estranged daughter, Larkin. It details the takeover of Earthseed by right-wing fundamentalist Christians, Lauren's attempts to survive their religious "re-education", and the final triumph of Earthseed as a community and a doctrine.  In between her Earthseed novels, Butler published the collection Bloodchild and Other Stories (1995), which includes the short stories "Bloodchild", "The Evening and the Morning and the Night", "Near of Kin", "Speech Sounds", and "Crossover", as well as the non-fiction pieces "Positive Obsession" and "Furor Scribendi".
Question: How many copies were sold?. Whats the answer?