Which number should replace the question mark?

When the gambler wakes up from dreaming about a huge glowing number 5 made of gold and diamonds, he knows it's an omen. So he grabs a racing form and looks up that day's fifth race. Sure enough, the number 5 horse in the fifth race is Fifth Element. So for the rest of the day he does everything in fives: He eats five bowls of cereal for breakfast, goes for a five-mile run, takes a five minute shower, and wears the fifth jacket he finds in his closet.
At the racetrack, he buys five programs, bets $555 on the fifth horse in the fifth race, and sits in the fifth seat of the fifth row of the bleachers in section five.
And when the gun goes off, he settles in and watches his horse come in fifth.