'Sum' in the Bible

And the king said to Joab the captain of the host, who was with him, Go now to and fro through all the tribes of Israel, from Dan even to Beer-sheba, and number ye the people, that I may know the sum of the people.

And Joab gave up the sum of the number of the people unto the king: and there were in Israel eight hundred thousand valiant men that drew the sword; and the men of Judah were five hundred thousand men.