Question: As of May 2017, how many digital units in the United States has the Jay-Z and Kanye West song that Chauncey Hollis, Jr is best known for sold?

The highest-selling albums and EPs in the United States are ranked in the "Billboard" 200, which is published by "Billboard" magazine.  The data are compiled by Nielsen Soundscan based on each album's weekly physical and digital sales, as well as on-demand streaming and digital sales of its individual tracks.  In 2015, a total of 39 albums claimed the top position of the chart.  One of which, American singer Taylor Swift's "1989" started its peak issue dated November 15, 2014. <ref name="1/3/15"> </ref> "1989" was the longest-running number-one album of the year, staying atop the chart for six weeks and was the best selling album of 2015 before Adele's "25", which managed to surpass the album's sales but after the year-end cut-off.  Canadian hip hop soul artist Drake's fourth commercial release, "If You're Reading This It's Too Late", became the third best-selling overall album and top-selling digital album with 535,000 digital units sold, 495,000 of which consisted of traditional whole album sales. <SEP>  In May 2011, Hollis had signed a deal with Kanye West's GOOD Music production wing, known as Very G.O.O.D. Beats and left the label after his contract expired in June 2013.  In December 2012, it was revealed he had signed a recording contract with Interscope Records, and subsequently founded his own record label imprint, Hits Since '87. Chauncey Hollis, Jr. (born May 21, 1987), better known by his stage name Hit-Boy, is an American record producer, rapper, singer and songwriter from Fontana, California.  He is perhaps best known for his production catalog, which includes "Niggas in Paris" by Jay-Z and Kanye West, "Drop the World" by Lil Wayne and Eminem, and the GOOD Music single "Clique", all of which have been certified platinum or higher by the Recording Industry Association of America (RIAA). <SEP> "Niggas in Paris" (edited for radio as "In Paris" or simply "Paris"; censored on the album as "Ni**as in Paris") is a song by American rappers Kanye West and Jay-Z from their collaboration album "Watch the Throne" (2011).  The song heavily samples "Dirty South Bangaz" by Big Fish Audio and also contains samples from "Baptizing Scene" by Reverend W.A. Donaldson, "Victory" by Puff Daddy featuring The Notorious B.I.G. and Busta Rhymes and also samples dialogue from DreamWorks Pictures' 2007 film "Blades of Glory".  On the week of the album's release the song debuted at number 75 on the US "Billboard" Hot 100 eventually peaking at number 5.  As of May 2017, it has sold 5 million digital units in the United States.  The single won Best Rap Performance and Best Rap Song at the 55th Annual Grammy Awards. <SEP> "City on Our Knees" is a song by Christian artist TobyMac from his album, "Tonight" (2010).  It was released as a radio single in August 2009 and reached No. 1 on "Billboard"' s Hot Christian Songs chart in October 2009.  It also reached No. 8 on Billboard's Heatseekers Songs.  The song was nominated for a Grammy Award as the Best Gospel Song.  The song also charted at No. 11 on the Bubbling Under Hot 100 Singles chart.  The song sold over 17,000 digital units in its first week.  As of February 20, 2010, the song has sold over 225,000 copies, making it the fastest charting and selling track of tobyMac's career.  It won a Dove Award for Pop/Contemporary Song of the year.