#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);
    if ((prime % 2 == 0) && (prime != 2)) {
      counter += 2;
    } else {
      if (prime <= 2) {
        if (prime == 2) {
          SINcounter++;
          continue;
        }
        continue;
      }
      for (j = 3; j <= 10000; j += 2) {
        if ((prime % j) == 0) {
          counter++;
        }
      }
    }
    if (counter == 1) {
      SINcounter++;
    }
    counter = 0;
  }
  printf("%d\n", SINcounter);
  return (0);
}
