There are 28 identical bookshelves in the library. Each bookshelf has 6 floors, and the number of books on each floor is the same. There are 19 books on one floor of a bookshelf. How many books are on the shelves in the library?
28 6 [OP_MUL] 19 [OP_MUL]
var_a = 28
var_b = 6
var_c = var_a * var_b
var_d = 19
var_e = var_c * var_d
print(int(var_e))