import java.util.*;

class Main{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        int n=sc.nextInt(),count=0;
        for(int ii=0;ii<n;ii++){
            int k = sc.nextInt();
            boolean flg = true;
            for(int i=2;i<=Math.sqrt(k);i++){
                if(k%i==0){flg=false;break;}
            }
            if(flg){
                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