You are given a sentence in Hebrew. Your job is to translate the Hebrew sentence into English.

השאירו את ידיכם למעלה, אם אתם יודעים מי זה.

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
Keep your hands up, if you know who this is.