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?
Sentence (from "Hit-Boy"): 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.
Relevant evidence: Yes