Adjustable BookShelf

Problem description. Harshit is a librarian.In his library he has only one bookshelf of infinite height but finite width such that a shelf can contain only K numbers of books and that the height of each row is vertically adjustable. Harshit has height H and a stair of height S. He is given N number of books of different heights which is to be put into the shelf. He can do this only if he reach