import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int cnt = 0;
        for (int i = 0; i < n; i++){
            int m = Integer.parseInt(br.readLine());
            if (isPrime(m)){
                cnt++;
            }
        }
        System.out.println(cnt);
    }
    static boolean isPrime(int q){
        if (q == 2) return true;
        if (q < 2 || ((q & 1) == 0)) return false;
        
        int i = 3;
        while (i * i <= q){
            if (q % i == 0){
                return false;
            }
            i += 2;
            //if ((i & 1) == 0) i++;
        }
        return true;
        
    }
}
/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