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: Time Limit Exceeded)

def isPrime(num)
	1.upto(num){|i|
		if num%i==0 && i!=num && i!=1 then
			return false
		end
 	}
end

n = gets.to_i
nums = []
n.times{nums << gets.to_i}

count = 0
nums.each{|num|
 count += 1 if isPrime num
}
puts count