#include <bits/stdc++.h>
int main() {
  int i, j, n, s, d;
  int a[10000];
  scanf("%d", &n);
  s = n;
  for (i = 0; i < n; i++) {
    scanf("%d", &a[i]);
  }
  for (i = 0; i < n; i++) {
    for (j = 2; j < a[i]; j++) {
      if (a[i] % j == 0 || a[i] % 2 == 0) {
        s = s - 1;
        break;
      }
    }
  }
  printf("%d\n", s);
}
