def eratosthenes(n)
	table = Array.new(n + 1,true)
	prime_list = []

	(2..n).each do |num|
			if table[num] == true
				prime_list << num
			k = num * num
			while k <= n
				table[k] = false
				k += num
			end
		end
	end
	return prime_list
end

def main()
	n = gets.to_i
	a = []
	n.times.each { |i|
		a.push(gets.to_i)
	}
	primes = eratosthenes(10000)
	cnt = 0
	a.each { |e|
		if primes.include?(e) then
			cnt += 1
		end
	}
	puts cnt
end

main

