@firstbitdrv - ChrisG was referring to hexadecimal math, when he noted about counting to 16... If you can understand (add / subtract / work with) hex, you have a much better chance at success.
~ hayabusa ~
"All men can see these tactics whereby I conquer, but what none can see is the strategy out of which victory is evolved." - Sun Tzu, 'The Art of War'
OSCE, OSCP , GPEN, C|EH