import java.util.*;
import java.io.*;
import java.lang.*;

public class Main {
    static final int INF = 1000000000;     
    
    public static void main(String[] args) throws Exception {                
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int res = 0;
        for (int i = 0; i < n; ++i) {
            int x = input.nextInt();
            if (isPrime(x)) ++res;
        }
        System.out.println(res);
    }       
    
    static boolean isPrime(int x) {
        if (x < 2) return false;
        for (int i = 2; i <= Math.sqrt(x); ++i) {
            if (x % i == 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