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

public class Main {
    private static final int SIZE = 10000000;

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int count = 0;
        for (int i = 0; i < n; i++) {
            long p = Long.parseLong(br.readLine());
            if (prime(p)) {
                count++;
            }
        }
        System.out.println(count);
    }

    static boolean prime(long n) {
        if (n == 2) {
            return true;
        } else if (n % 2 == 0) {
            return false;
        }
        for (int i = 3; i * i < n; i += 2) {
            if (n % i == 0) {
                return false;
            }
        }
        return true;
    }
}