import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner stdIn = new Scanner(System.in);
    int n = stdIn.nextInt();
    int[] a = new int[n];
    int count = 0;
    for (int i = 0; i < n; i++) {
      a[i] = stdIn.nextInt();
      if (a[i] < 2) continue;
      if (a[i] == 2) {
        count++;
        continue;
      }
      if (a[i] % 2 == 0) continue;
      for (int j = 3; j <= n / j; j+= 2) {
        if (a[i] % j == 0) break;
      }
      count++;
    }
    System.out.println(count);
  }
}