import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		
		int flag, num, cnt = 0;
		
		for(int i = 0; i < n; i++) {
			flag = 0;
			
			num = sc.nextInt();
			
			if(num % 2 == 0 && num != 2) {
				flag = 1;
			}
			
			for(int j = 3; j <= Math.sqrt(num) && flag == 0; j+=2) {
				if(num % j == 0) {
					flag = 1;
					break;
				}
			}
			
			if(flag == 0) {
				cnt++;
			}
		}
		System.out.println(cnt);
	}
}
/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