import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		// Scanner sc = new Scanner(new File("test_1.txt"));
		// Scanner sc = new Scanner(new File("test_2.txt"));
		// Scanner sc = new Scanner(new File("in4.txt"));
		int N = sc.nextInt();
		List<Integer> list = new ArrayList<Integer>();
		for (int i = 0; i < N; i++) {
			list.add(sc.nextInt());
		}
		
		int ans = 0;
		for (int n : list) {
			boolean is_prime = true;
			for (int i = 2; i * i <= n; i++)
				if (n % i == 0)
					is_prime = false;
			if (is_prime)
				ans++;
		}
		System.out.println(ans);		
		
	}
}
/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