Question: Cornell Iral Haynes Jr. had released how many studio albums as of 2013?

Related documents: [0]  [DOC] Cornell Iral Haynes Jr. (born November 2, 1974), known professionally as Nelly, is an American rapper, singer, songwriter, entrepreneur, investor, and occasional actor from St. Louis, Missouri. Nelly embarked on his music career with Midwest hip hop group St. Lunatics, in 1993 and signed to Universal Records in 1999. Under Universal, Nelly began his solo career in the year 2000, with his debut album "Country Grammar", of which the title-track was a top ten hit. The album debuted at number three on the "Billboard" 200 and went on to peak at number one. "Country Grammar" is Nelly's best-selling album to date, selling over 8.4 million copies in the United States. His following album "Nellyville", produced the number-one hits "Hot in Herre" and "Dilemma" (featuring Kelly Rowland). Other singles included "Work It" (featuring Justin Timberlake), "Air Force Ones" (featuring Murphy Lee and St. Lunatics), "Pimp Juice" and "#1". [END] 
[1]  [DOC] M.O. is the seventh studio album by American hip hop recording artist Nelly. The album was released on September 30, 2013, by Republic Records, as the follow up to his sixth album, "5.0" (2010). The album is preceded by the release of its lead single, "Hey Porsche", released on February 19, 2013, and reached number forty-two on the US "Billboard" Hot 100. "Get Like Me", featuring Nicki Minaj and Pharrell, premiered online on June 18, 2013, and was officially released on July 2, 2013, as the album's second single. The album features guest appearances from Nicki Minaj, Pharrell, Future, T.I., Daley, 2 Chainz, Trey Songz, Fabolous, Wiz Khalifa, Florida Georgia Line, Nelly Furtado and Yo Gotti. [END]  
Answer: seventh
seventh