I need an answer fast.

(13-09-2022) Let n number of identical small boxes are there where each of the first i boxes contains a diamond and remaining ni are empty. Harry Potter got two magic sticks that can test whether a box is empty or not in a single touch, except that a magic stick vanishes if he tests it on an empty box. How Harry Potter knows the value of i using two magic sticks to determine all the boxes containing pearls using at most o(n) touches