#include <bits/stdc++.h>
int prime(int x) {
  int i;
  int answer = 0;
  for (i = 2; i < x; i++) {
    if (x % i == 0) {
      answer = 1;
      break;
    }
  }
  return (answer != 1) ? 1 : 0;
}
int main() {
  int n;
  int i;
  int num[20000];
  int count = 0;
  scanf("%d", &n);
  for (i = 0; i < n; i++) {
    scanf("%d", &num[i]);
    if (prime(num[i]) == 1) {
      count += 1;
    }
  }
  printf("%d\n", count);
  return 0;
}
