any done the juice plus diet ?

Hi All

was thinking of doing the juice plus shake diet plan, but after doing some research i noticed that a full tin gives you 12 shakes and they say you need 6 tins for the entire 12 week plan, so 6 * 12 is 72 shakes

but to do the plan you have 2 shakes a day for the first 6 weeks ( 42 days ) = 84 shakes
then 1 shake a day for the next 6 weeks ( 42 days ) = 42 shakes

maybe i am crazy or missing something but how do you get 126 shakes out of 72 ??