In this task, given a sentence in the English language, your task is to convert it into English Tokens.

He will officially become the Philippines's fifteenth president on June 30.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
He will officially become the Philippines 's fifteenth president on June 30 .