#include <bits/stdc++.h>
int main(void) {
  int n, a, b, i, j, count = 0, A[10000];
  scanf("%d", &n);
  for (i = 0; i < n; i++) {
    scanf("%d", &a);
    j = 2;
    b = sqrt(a);
    while (a % j > 0 && j <= b) j++;
    if (j == b) {
      A[count] = a;
      count++;
    }
  }
  printf("%d\n", count);
  return 0;
}
