Pirate Gold Division

Easy logic-puzzles interview practice: Pirate Gold Division.

Five pirates (ranked 5 to 1, with 5 being the leader) must divide 100 gold coins. The leader proposes a split; if at least 50% vote yes (including the leader), it passes. Otherwise, the leader is eliminated and the next pirate proposes. All pirates are perfectly rational, greedy, and prefer survival. How many coins does Pirate 5 (the leader) keep in the optimal proposal?

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