#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int n;
  vector<int> v(10000);
  int flg = 0;
  int count = 0;
  cin >> n;
  for (int k = 0; k < n; k++) {
    cin >> v[k];
    for (int i = 2; i <= v[k]; i++) {
      for (int j = 2; j <= sqrt(v[k]); j++) {
        if (i % j == 0 && i != j) {
          flg = 1;
        }
      }
      if (flg == 0) {
        count = count + 1;
      }
      flg = 0;
    }
  }
  cout << count << endl;
  return 0;
}
