Cannibals and missioners

Missionaries came to the island on which inhabit very vicious cannibals, they love people and now has missionaries want to do so that would be their shared river, which does not give the opportunity to eat cannibals ordinary people! But you have to and you think a little, because just smuggle cannibals does not work, they can eat at any time of the common man, and you have to solve the riddle of this smuggle!