#include <bits/stdc++.h>
int main() {
  int n, A[10000], i, j, count = 0, flag;
  scanf("%d", &n);
  for (i = 0; i < n; i++) scanf("%d", &A[i]);
  for (j = 0; j < n; j++) {
    flag = 0;
    if (A[j] != 2) {
      if (A[j] % 2 == 1) {
        for (i = 2; i < A[j] / 2; i++) {
          if (A[j] % i == 0) {
            flag = 1;
            break;
          }
        }
        if (flag == 0) count++;
      }
    } else
      count++;
  }
  printf("%d\n", count);
  return 0;
}
