import java.util.Scanner;

class Main {
	public static void main(String[] args) throws Exception {

		Scanner scanner = new Scanner(System.in);// ??\?????????????????????
		int count = scanner.nextInt();
		int flag = 0;
		
		for(int i = 0; i < count; i++){
			int num = scanner.nextInt();
			for(int j = (int) Math.sqrt(num); 1 < j; j--){
				if(j == 1){
					break;
				}
				if(num % j == 0){
					flag++;
					break;
				} 
			}
		}
		System.out.println(count - flag);
	}
}
/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