#include <bits/stdc++.h>
int main() {
  int check(int);
  int n;
  int number[10000];
  int i;
  int count = 0;
  scanf("%d", &n);
  for (i = 0; i < n; i++) {
    scanf("%d", &number[i]);
    if (check(number[i]) == 1) count++;
  }
  printf("%d\n", count);
  return 0;
}
int check(int x) {
  int i;
  if (x == 2) return 1;
  for (i = 2; i < x; i++) {
    if (x % i == 0)
      return 0;
    else if (i == x - 1)
      return 1;
  }
}
