import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public 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[] numbers = new int[n];
		
		for (int i = 0; i < n; i++){
			numbers[i] = Integer.parseInt(br.readLine());;
		}
		
		int ans = 0;
		
		for (int i = 0; i < numbers.length; i++) {
			boolean flag = true; 
			
			int j = 2;
			while(j <= Math.sqrt(numbers[i])){
				if(numbers[i] % j == 0){
					flag = false;
					break;
				}
				j++;
			}
			
			if (flag){
				ans++;
			}
			
		}
		
		System.out.println(ans);
		
	}
	
}
/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