Problem:
Prime Numbers

A prime number is a natural number which has exactly two distinct natural number divisors: 1 and itself. For example, the first four prime numbers are: 2, 3, 5 and 7.

Write a program which reads a list of N integers and prints the number of prime numbers in the list.

Input

The first line contains an integer N, the number of elements in the list.

N numbers are given in the following lines.

Output

Print the number of prime numbers in the given list.

Constraints

1 ≤ N ≤ 10000

2 ≤ an element of the list ≤ 108

Sample Input 1

5
2
3
4
5
6

Sample Output 1

3

Sample Input 2

11
7
8
9
10
11
12
13
14
15
16
17

Sample Output 2

4

Solution in Ruby (judge verdict: Wrong Answer)

n = gets.chomp.to_i
ns = []
pns = []
n.times do |i|
  ns.push(gets.to_i)
end
result = 0
e = n+1
e.times do |i|
if i == 2
  pns.push(i)
  result+=1
elsif i == 1
elsif i == 0
else
  judge = true
  pns.each do |number|
      if i % number == 0
        judge = false
        break
      end
  end
  if judge
    pns.push(i)
    result+=1
  end
end
end
puts result+1