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