How many chappathis?

In a party, one of Santa Singh's friends asked him how many chappathis he could eat on an empty stomach. Santa replied "Seven".

Then his friend told him "When you eat the first chappathi your stomach is no longer empty. Then how can you eat seven??"

Santa was impressed by this tricky question. So, as soon as he went back home he asked his wife "How many chappathis can you eat on an empty stomach??". She replied "Five".

Then Santa said: "If only you had told seven I had a nice reply for it".