Utilitarianism is mutually opposed to selfishness, so clearly they're going to get thenself run over and keep their beliefs.

Bentham stated that Utilitarianism is to promote happiness and prevent harm for the affected individuals. Meaning not only yourself but also those 5.

HOWEVER: What if those five have to live in poverty as a result? What if they all signed up for this? What if only 4 signed up for this?