#include <bits/stdc++.h>
int main(void) {
  int i, j, k, N;
  int cnt = 0;
  scanf("%d", &N);
  int a[10000];
  for (i = 3; i <= N * 2 + 1; i += 2) {
    scanf("%d", &a[i]);
  }
  for (i = 3; i <= N * 2 + 1; i += 2) {
    k = 0;
    for (j = 2; j < a[i]; j++) {
      if (a[i] % j == 0) {
        k = 1;
        break;
      }
      if (k == 0) {
        cnt++;
      }
    }
  }
  printf("%d", cnt);
  return 0;
}
