#include <bits/stdc++.h>
using namespace std;
int main() {
  int num, ans = 0;
  int temp;
  cin >> num;
  for (int i = 0; i < num; i++) {
    cin >> temp;
    for (int j = 2; j <= sqrt(temp); j++) {
      if (temp % j == 0) goto nex;
    }
    ans++;
  nex:;
  }
  cout << ans;
  return 0;
}
