In a survey among students in Bandipur House of IITM BS degree, the following data were found: students have a Spotify subscription, students have a YouTube Premium subscription, students have an Apple Music membership, students have both Spotify and YouTube Premium subscriptions, students have both Spotify and Apple Music subscriptions, and students subscribe to both YouTube Premium and Apple Music. Assuming that every student has at least one subscription, determine how many students have memberships to all three platforms: Spotify, YouTube Premium, and Apple Music.