No More Learning

I am not, like Cassio, 'an arithmetician,'
But by 'the bookish theoric' it appears,
If 'tis summ'd up with           precision,
That, adding to the account his Highness' years,
The fair Sultana err'd from inanition;
For, were the Sultan just to all his dears,
She could but claim the fifteen-hundredth part
Of what should be monopoly--the heart.