PV (t)	be the payoff to vaccinate on day t where t = 1 is the day that the index case is infectious and starts showing symptoms.
PN	is the payoff not to vaccinate at all.
rvacc	the penalty to vaccinate, i.e., the risk of adverse events.
rinf	the penalty due to being infected, i.e., the disease complication risk.
L	is the payoff before penalties, i.e., the number of life years if never vaccinated and never infected.