import java.util.*;

public class Main {
    private static final Scanner scn = new Scanner(System.in);
    
    public static void main(String[] args) {
        int c = 0, n = scn.nextInt();
        for(int i = 0; i < n; i++) {
            c += primeCheck(scn.nextInt());
        }
        System.out.println(c);
    }
    
    private static int primeCheck(int x) {
        int rslt = 1;
        if(x < 2 || x > 3 && x % 2 == 0) {
            rslt = 0;
        }
        for(int i = 3; i <= x / i; i += 2) {
            if(x % i == 0) {
                rslt = 0;
                break;
            }
        }
        return rslt;
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz