#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++) {
    for (j = a[i] / 2; j > 1; j--) {
      if (a[i] % j == 0) {
        count--;
        break;
      }
    }
  }
  printf("%d\n", count);
  return 0;
}
