On a mountain, three shepherds cyclically alternate shearing the same herd of sheep. The shepherds agreed to obey the following rules: (i) Every day a sheep can be shorn* on one side only; (ii) Every day at least one sheep must be shorn; (iii) No two days the same group of sheep can be shorn. The shepherd who first breaks the agreement will have to accompany the herd in the valley next fall. Can anyone of the shepherds shear the sheep in such a way to make sure that he will avoid this punishment? *shorn is the past tense of shear