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