#include <bits/stdc++.h>
int main(void) {
  int i;
  int n;
  int prime;
  int j = 0;
  int counter = 0;
  int SINcounter = 0;
  scanf("%d", &n);
  for (i = 0; i < n; i++) {
    scanf("%d", &prime);
    for (j = 2; j <= 10000; j++) {
      if ((prime % j) == 0) {
        counter++;
      }
    }
    if (counter == 1) {
      SINcounter++;
    }
    counter = 0;
  }
  printf("%d\n", SINcounter);
  return (0);
}
