Bob's PartyTrick brain teasers appear difficult at first, but they have a trick that makes them really easy.
Bob was having a big party. He decided on a technique to get lots of people to come. He invited his five closest friends and said that they could each invite 4 people.
Each of those could invite 3.
Each of those could invite 2.
Each of those could invite 1.
Overall, how many people did Bob invite to his party?
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