#include <bits/stdc++.h>
using namespace std;
bool primeNum(int num) {
  if (num < 2)
    return false;
  else if (num == 2)
    return true;
  else if (num % 2 == 0)
    return false;
  for (int i = 3; i <= sqrt(num); i += 2) {
    if (num % i == 0) return false;
  }
}
int main(void) {
  int n;
  int count = 0;
  cin >> n;
  for (int i = 0; i < n; i++) {
    int a;
    cin >> a;
    if (primeNum(a)) count++;
  }
  cout << count << endl;
  return 0;
}
