#include <bits/stdc++.h>
int main() {
  int n, i, j;
  int a[10000];
  int count = 0;
  scanf("%d", &n);
  for (i = 0; i < n; i++) scanf("%d", &a[i]);
  count = n;
  for (i = 0; i < n; i++) {
    if (a[i] == 2)
      ;
    else if (a[i] % 2 == 0)
      count--;
    else {
      for (j = 3; j < a[i] / 3; j += 2) {
        if (a[i] % j == 0) {
          count--;
          break;
        }
      }
    }
  }
  printf("%d\n", count);
  return 0;
}
