import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int count=0;
		int n = Integer.parseInt(sc.nextLine());

		for(int i=0;i<n;i++){
			String s=sc.nextLine();
			int num=Integer.parseInt(s);
			double numDouble=Double.parseDouble(s);
			int divor=Math.round(Math.round(Math.sqrt(numDouble)))+1;
			boolean f=true;
			for(int j=2;j<divor;j++){
				if(num%j==0){
					f=false;
					break;
				}
			}
			if(f){
				count++;
			}
		}
		System.out.println(count);
	}
}


/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