#include <bits/stdc++.h>
int main() {
  int n[1000], count[1000], k, s, i, j;
  for (i = 0; i < 1000; i++) {
    count[i] = 0;
  }
  k = 0;
  scanf("%d\n", &s);
  for (i = 0; i < s; i++) {
    scanf("%d\n", &n[i]);
    for (j = 1; j <= n[i]; j++) {
      if (n[i] % j == 0) {
        count[i] = count[i] + 1;
      }
    }
    if (count[i] == 2) {
      k = k + 1;
    }
  }
  printf("%d \n", k);
  return 0;
}
