Bookshelf Height Calculator

You are given a sorted list of bookshelf heights in centimeters. Your task is to find the maximum height that is less than or equal to a specified height using binary search. If all bookshelves are taller than the specified height, return -1. Input format: - The first line contains an integer n (1 ≤ n ≤ 500) representing the number of bookshelves. - The second line contains n space-separated integers representing the heights of the bookshelves. - The third line contains an integer representing the target height. Output format: - Print the maximum bookshelf height that is less than or equal to the target height, or -1 if none exist. Example: Input: 5 150 160 170 180 190 165 Output: 160