#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  int sum = 0;
  cin >> N;
  while (N--) {
    int a;
    cin >> a;
    if (a >= 2) {
      ++sum;
      for (int i = 2; i * i <= a; ++i) {
        if (a % i) {
          --sum;
          break;
        }
      }
    }
  }
  cout << sum << endl;
  return 0;
}
