import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int cnt = 0;
		for(int i = 0; i < n; i++){
			if(judge(sc.nextInt())) cnt++;
		}
		System.out.println(cnt);
	}
	static boolean judge(int tmp){
		if(tmp==2 || tmp==3 || tmp==5 || tmp==7) return true;
		if(tmp % 2 == 0) return false;
		for(int i = 3; i <= Math.sqrt(tmp); i++){
			if(tmp % i == 0) return false;
		}
		return true;
	}
}