import java.util.*;

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

