def eddington(rides)
	eds = []
	rides.each{ |ride|
		if (rides.select{ |i| i==ride}.length) >= ride
			eds.push ride
		end
	}
	eds.sort[-1]
end

rides = [7, 7, 7, 3, 3, 3, 14, 5, 2, 2]
puts eddington(rides)