#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int cnt = 0;
  for (int i = 0; i < n; i++) {
    int x;
    cin >> x;
    int j = 3;
    if (x % 2 == 0 && x != 2) continue;
    while (j < sqrt(x)) {
      if (x % j == 0) break;
      j = j + 2;
    }
    cnt++;
  }
  cout << cnt << endl;
}
