Common-sense morality seems to tell us that a rescuer who can save either one individual or five other individuals from death has a duty to save the greater number. But contractualism, a moral theory on which principles must be justifiable to individuals, seems to imply that it is permissible to save the one. This is because a commitment to individual justification blocks the possibility of appealing to the aggregate amount of lives saved. Does contractualism really have this implication? If so, (...) should we side with the common-sense approach, or is there any reason to side with the contractualist? In this paper, I first examine a new argument from Jay Wallace which claims to reconcile contractualism with a duty to save the greater number. I find the argument to be unsuccessful. I then suggest that common-sense morality doesn't support a duty to save the greater number as straightforwardly as it might initially seem as it might initially seem. I introduce two mundane cases in which the permissibility of saving either the lesser or greater number is intuitively plausible, and I offer some reasons to think that the permissibility of saving the lesser number coheres with our value judgements more generally. (shrink)