import java.util.Scanner;

public class Main {
	public static void main(String[] args){

		Scanner sc = null;

		try {
			sc = new Scanner(System.in);
			//??´??°????????°???????????????
			int loop = sc.nextInt();

			//??????????????¨?????°
			int count = 0;

			//??\??????????????????(?????????)
			for (int i = 0; i < loop; i++) {
				int num = sc.nextInt();

				//?´???°????????§??????
				boolean check = true;
				double border = Math.sqrt(num);
				if (num == 2 || num % 2 != 0) {

					//1??¨????????°??\?????§???????????????????????§??????
					for (int j = 3; j < border; j+=2) {
						if ((num % j) == 0) {
							check = false;
							break;
						}
					}
				}else {
					check = false;
				}

				//?´???°??????????????????
				if (check) {
					count++;
				}
			}
			//????????????
			System.out.println(count);
		}catch (Exception e) {
			System.out.println(e);
		} finally {
			if (sc != null) {
				sc.close();
			}
		}
	}
}