#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a, c = 0;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a;
    if (a == 2)
      c++;
    else if (a < 2 || a % 2 == 0)
      continue;
    else {
      for (int x = 3; x <= sqrt(a); a++) {
        if (a % x == 0) {
          c--;
          break;
        }
      }
      c++;
    }
  }
  cout << c << endl;
  return 0;
}
