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: Accepted)

import java.util.Scanner;

public class Main {

	public static boolean checkPrimeNum(int x) {
		int border = (int)Math.sqrt(x) + 1;

		for(int i = 2; i < border; i++) {
			if(x % i == 0) {
				return false;
			}
		}

		return true;
	}

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int num = scan.nextInt();
		int x;
		int count = 0;

		for(int i = 0; i < num; i++) {
			x = scan.nextInt();
			if(checkPrimeNum(x)) {
				count++;
			}
		}

		System.out.println(count);

	}
}