Shyam and Neha have bookshelves of the same size and holding books of the same sizes. Shyam's shelf is $\large\frac{1}{2}$ full and Neha's shelf is $\large\frac{4}{5}$ full. If 21 more books of the same size are distributed among them, then they can fill their shelves completely. How many books does Neha have today?
