import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		int ans=0;
		for(int i=0;i<n;i++){
			int x=sc.nextInt();
			if(isPrime(x)) ans++;
		}
		System.out.println(ans);
	}
	static boolean isPrime(int x){
		for(int j=2;j<=Math.sqrt(x);j++){
			if(x%j==0){
				return false;
			}
		}
		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