#include <bits/stdc++.h>
int prime(int a);
int main(int argc, const char* argv[]) {
  int a[10000], n, sum = 0, i;
  scanf("%d", &n);
  for (i = 0; i < n; i++) {
    scanf("%d", &a[i]);
  }
  for (i = 0; i < n; i++) {
    sum += prime(a[i]);
  }
  printf("%d\n", sum);
}
int prime(int a) {
  int i, count = 0;
  for (i = 2; i < a; i++) {
    if (a % i == 0) count++;
  }
  if (count >= 1)
    return 0;
  else
    return 1;
}
