Question: What number of No. 1 hits did the rockers behind 'Fair Warning' have?

full_context: Document 1: Jump (Van Halen song): "Jump" is a song by American hard rock band Van Halen. It was released in December 1983 as the lead single from their album "1984". It is Van Halen's most successful single to date, reaching number 1 on the US "Billboard" Hot 100. The song differs from earlier Van Halen songs in that it is driven by a keyboard line (played on an Oberheim OB-Xa) although the song does contain a guitar solo, which was spliced together from multiple takes. David Lee Roth dedicated the song to martial artist Benny Urquidez, of whom he was a student.
Document 2: Queen (band): The band have released a total of eighteen number one albums, eighteen number one singles, and ten number one DVDs worldwide, making them one of the world's best-selling music artists. Queen have sold over 150 million records, with some estimates in excess of 300 million records worldwide, including 34.5 million albums in the US as of 2004. Inducted into the Rock and Roll Hall of Fame in 2001, the band is the only group in which every member has composed more than one chart-topping single, and all four members were inducted into the Songwriters Hall of Fame in 2003. In 2009, "We Will Rock You" and "We Are the Champions" were inducted into the Grammy Hall of Fame, and the latter was voted the world's favourite song in a global music poll.
Document 3: Van Halen (album): Van Halen is the debut studio album by American hard rock band Van Halen. Released on February 10, 1978, the album peaked at # 19 on the Billboard 200. The album became widely recognized as the band's popularity grew, selling more than 10 million copies in the United States by August 7, 1996 and being certified Diamond.
Document 4: Van Halen discography: As of 2007, Van Halen has sold 75 million albums worldwide and have had thirteen No. 1 hits on the Billboard Mainstream Rock chart. During the 1980s they also had more Billboard Hot 100 hits than any other hard rock or heavy metal band. According to the RIAA, Van Halen is the nineteenth best - selling band / artist of all time with sales of over 56 million albums in the US, and is one of five rock bands that have had two albums (Van Halen and 1984) sell more than ten million copies in the US.
Document 5: Hard rock: Established bands made something of a comeback in the mid-1980s. After an 8-year separation, Deep Purple returned with the classic Machine Head line-up to produce Perfect Strangers (1984), which reached number five in the UK, hit the top five in five other countries, and was a platinum-seller in the US. After somewhat slower sales of its fourth album, Fair Warning, Van Halen rebounded with the Top 3 album Diver Down in 1982, then reached their commercial pinnacle with 1984. It reached number two on the Billboard album chart and provided the track "Jump", which reached number one on the singles chart and remained there for several weeks. Heart, after floundering during the first half of the decade, made a comeback with their eponymous ninth studio album which hit number one and contained four Top 10 singles including their first number one hit. The new medium of video channels was used with considerable success by bands formed in previous decades. Among the first were ZZ Top, who mixed hard blues rock with new wave music to produce a series of highly successful singles, beginning with "Gimme All Your Lovin'" (1983), which helped their albums Eliminator (1983) and Afterburner (1985) achieve diamond and multi-platinum status respectively. Others found renewed success in the singles charts with power ballads, including REO Speedwagon with "Keep on Loving You" (1980) and "Can't Fight This Feeling" (1984), Journey with "Don't Stop Believin'" (1981) and "Open Arms" (1982), Foreigner's "I Want to Know What Love Is", Scorpions' "Still Loving You" (both from 1984), Heart’s "What About Love" (1985) and "These Dreams" (1986), and Boston's "Amanda" (1986).
Document 6: The Best of Both Worlds (Van Halen album): The Best of Both Worlds is the second greatest hits album by American hard rock band Van Halen, released on July 20, 2004 on Warner Bros. The compilation features material recorded with lead vocalists David Lee Roth and Sammy Hagar, but omitting Gary Cherone's three-year tenure with the band. Prior to "The Best of Both Worlds"' release, Hagar reunited with Van Halen, and the band subsequently recorded three new tracks to include on the release.
Document 7: Hard rock: Bon Jovi's third album, Slippery When Wet (1986), mixed hard rock with a pop sensitivity and spent a total of 8 weeks at the top of the Billboard 200 album chart, selling 12 million copies in the US while becoming the first hard rock album to spawn three top 10 singles — two of which reached number one. The album has been credited with widening the audiences for the genre, particularly by appealing to women as well as the traditional male dominated audience, and opening the door to MTV and commercial success for other bands at the end of the decade. The anthemic The Final Countdown (1986) by Swedish group Europe was an international hit, reaching number eight on the US charts while hitting the top 10 in nine other countries. This era also saw more glam-infused American hard rock bands come to the forefront, with both Poison and Cinderella releasing their multi-platinum début albums in 1986. Van Halen released 5150 (1986), their first album with Sammy Hagar on lead vocals, which was number one in the US for three weeks and sold over 6 million copies. By the second half of the decade, hard rock had become the most reliable form of commercial popular music in the United States.
Document 8: Unchained (song): "Unchained" is a song from Van Halen's fourth album, "Fair Warning". Vocalist David Lee Roth's working title for the song was "Hit the Ground Running". The song features prominent use of the MXR M-117 flanger, which became a popular sound and spurred sales of the pedal. A preset for the flanger was also included on the EVH Flanger MXR pedal. It uses a Drop Db tuning with suspended fourth chords interspersed. The song is notable for being producer Ted Templeman's only vocal contribution to the band when he says "Come on, Dave, gimme a break!" during the interlude of the song.
Document 9: Runnin' with the Devil: "Runnin' with the Devil" is the second single from Van Halen's 1978 eponymous debut album. The song lyrics were inspired by the Ohio Players song "Runnin' from the Devil". In 2009, it was named the 9th greatest hard rock song of all time by VH1.
Document 10: Finish What Ya Started: "Finish What Ya Started" is a song by Van Halen taken from their 1988 album "OU812". Despite the album being seemingly complete, Eddie Van Halen came up with the riff at 2 in the morning and went down to his then-neighbor Sammy Hagar to show it. Hagar let Eddie in, and the two played guitars in his balcony until they had a completed song. Once Eddie left, Hagar decided to write the lyrics despite being late at night. The theme wound up being unfulfilled sex, summed up by Hagar as "blue balls". In the song, Eddie Van Halen recorded his guitar part on a Fender Stratocaster plugged direct into the studio mixing console. The song is one of only two Van Halen tracks featuring Sammy Hagar playing a rhythm guitar part, which he played on a Gibson acoustic.
Document 11: Dance the Night Away (Van Halen song): "Dance the Night Away" was Van Halen's first top 20 U.S. hit, peaking at #15, and the second song from their 1979 album "Van Halen II". While the rest of the songs from this album had existed in various forms since their days doing demos and playing clubs, this song was possibly the only song written during the recording sessions for the album. The band members conceived the song during the recording sessions while they were standing in a circle humming to each other. It was inspired by Fleetwood Mac's "Go Your Own Way". Eddie Van Halen purposely left a guitar solo out of the final version of the song, replacing it instead with a riff of tap harmonics. David Lee Roth originally wanted to call the song "Dance, Lolita, Dance", but Eddie Van Halen convinced him that "Dance the Night Away" was more suitable and the chorus was changed to reflect that.
Document 12: Beat It: Eddie Van Halen, lead guitarist of hard rock band Van Halen, was asked to add a guitar solo. When initially contacted by Jones, Van Halen thought he was receiving a prank call. Having established that the call was genuine, Van Halen borrowed an amp from Allan Holdsworth and recorded his guitar solo free of any charge. ``I did it as a favor '', the musician later said.`` I was a complete fool, according to the rest of the band, our manager and everyone else. I was not used. I knew what I was doing -- I do n't do something unless I want to do it.'' Van Halen recorded his contribution following Jones and Jackson arriving at the guitarist's house with a ``skeleton version ''of the song. Fellow guitarist Steve Lukather recalled,`` Initially, we rocked it out as Eddie had played a good solo -- but Quincy thought it was too tough. So I had to reduce the distorted guitar sound and that is what was released.'' The song was among the last four completed for Thriller; the others were ``Human Nature '',`` P.Y.T. (Pretty Young Thing)'' and ``The Lady in My Life ''.
Document 13: Hot for Teacher: "Hot for Teacher" is a song by the American rock band Van Halen, taken from their sixth studio album, "1984". The song was written by band members Eddie Van Halen, Alex Van Halen, Michael Anthony and David Lee Roth, and produced by Ted Templeman. It was released as the fourth and final single from the album in October 1984. It was the final single released by Van Halen's original lineup.
Document 14: Hard rock: With the rise of disco in the US and punk rock in the UK, hard rock's mainstream dominance was rivalled toward the later part of the decade. Disco appealed to a more diverse group of people and punk seemed to take over the rebellious role that hard rock once held. Early punk bands like The Ramones explicitly rebelled against the drum solos and extended guitar solos that characterised stadium rock, with almost all of their songs clocking in around two minutes with no guitar solos. However, new rock acts continued to emerge and record sales remained high into the 1980s. 1977 saw the début and rise to stardom of Foreigner, who went on to release several platinum albums through to the mid-1980s. Midwestern groups like Kansas, REO Speedwagon and Styx helped further cement heavy rock in the Midwest as a form of stadium rock. In 1978, Van Halen emerged from the Los Angeles music scene with a sound based around the skills of lead guitarist Eddie Van Halen. He popularised a guitar-playing technique of two-handed hammer-ons and pull-offs called tapping, showcased on the song "Eruption" from the album Van Halen, which was highly influential in re-establishing hard rock as a popular genre after the punk and disco explosion, while also redefining and elevating the role of electric guitar.
Document 15: Beat It: Eddie Van Halen, lead guitarist of hard rock band Van Halen, was asked to add a guitar solo. When initially contacted by Jones, Van Halen thought he was receiving a prank call. Having established that the call was genuine, Van Halen borrowed an amplifier from guitarist Allan Holdsworth and recorded his guitar solo free of any charge. ``I did it as a favor '', the musician later said.`` I was a complete fool, according to the rest of the band, our manager and everyone else. I was not used. I knew what I was doing -- I do n't do something unless I want to do it.'' Van Halen recorded his contribution following Jones and Jackson arriving at the guitarist's house with a ``skeleton version ''of the song. Fellow guitarist Steve Lukather recalled,`` Initially, we rocked it out as Eddie had played a good solo -- but Quincy thought it was too tough. So I had to reduce the distorted guitar sound and that is what was released.'' The song was among the last four completed for Thriller; the others were ``Human Nature '',`` P.Y.T. (Pretty Young Thing)'' and ``The Lady in My Life ''.
ground_truth: thirteen
sub_queries: Fair Warning >> performer Answer: Van Halen
how many number 1 hits did Van Halen have Answer: thirteen