#include <bits/stdc++.h>
using namespace std;
bool isPrime(int x) {
  if (x == 2) {
    return 2;
  }
  if (x % 2 == 0) {
    return false;
  }
  for (int w = 3; w < sqrt(x); w += 2) {
    if (x % w == 0) {
      return false;
    }
  }
  return true;
}
int main() {
  int i, p;
  int count = 0;
  cin >> i;
  for (int j = 0; j < i; j++) {
    cin >> p;
    if (isPrime(p)) {
      count++;
    }
  }
  cout << count << endl;
}
