Passage: Jackson's first album in five years, Bad (1987), was highly anticipated, with the industry expecting another major success. It became the first album to produce five US number-one singles: "I Just Can't Stop Loving You", "Bad", "The Way You Make Me Feel", "Man in the Mirror", and "Dirty Diana". Another song, "Smooth Criminal", peaked at number seven. Bad won the 1988 Grammy for Best Engineered Recording – Non Classical for "Leave Me Alone". Jackson won an Award of Achievement at the American Music Awards in 1989 after Bad generated five number-one singles, became the first album to top the charts in 25 countries and the best-selling album worldwide in 1987 and 1988. By 2012, it had sold between 30 and 45 million copies worldwide.The Bad world tour ran from September 12, 1987 to January 14, 1989. In Japan, the tour had 14 sellouts and drew 570,000 people, nearly tripling the previous record for a single tour. The 504,000 people who attended seven sold-out shows at Wembley Stadium set a new Guinness world record.

Question: How many number-one singles did the album have?
five