import java.io.*;
    
class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int i, j;
        int count = 0;
    
        for(i=0; i<n; i++){
            int a = Integer.parseInt(br.readLine());
            for(j=2; (j*j)<=a; j++){
                if(a%j == 0) break;
            }
            if((j*j)>a) 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