A Rabbi and a Confessional

One day a priest had a doctor’s appointment and needed someone to cover for him at the confessional, so he calls over an old school chum of his who happens to be a rabbi.
The rabbi had no idea what to do but agreed to cover for the priest. The priest needed to show the rabbi how everything worked, so when the first person came in the priest said, “What is your sin my son?”
The man said “I’ve commited adultery.”
The priest asks, “How many times?”
The man says, “3 times.”
The priest replies, “Do 10 Hail Marys, then put $5 in the donation box.”
Then the second man comes in and says he committed adultery also. When asked how many times he said 3. The priest replied again, “Do 10 Hail Marys then put $5 in the donation box.”
The rabbi tells the priest he has got the hang of it and that he should go to the doctor’s now.
After the rabbi is alone another man comes up to the confessional.
The rabbi asks, “What is your sin?”
The man replies, “I’ve committed adultery.”
The rabbi asks, “How many times?”
The man says, “Once.”
The rabbi says, “Go home, do it 2 more times. We’re having a special today. 3 for $5.”