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 JAVA (judge verdict: Wrong Answer)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String args[]) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		int[] numArray = new int[Integer.parseInt(br.readLine())];
		for (int i = 0; i < numArray.length; i++) {
			numArray[i] = Integer.parseInt(br.readLine());
		}

		int count = 0;
		for (int i = 0; i < numArray.length; i++) {
			if (isPrime(numArray[i])) {
				count++;
			}
		}

		System.out.println(count);
	}

	private static boolean isPrime(int num) {
		int key[] = { 2, 3, 5, 7 };
		for (int i = 0; i < key.length; i++) {
			if (num == key[i]) {
				return true;
			}
		}
		for (int i = 0; i < key.length; i++) {
			if ((num % key[i]) == 0) {
				return false;
			}
		}
		return true;
	}
}