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