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++) {
			int j = 2;
			boolean flag = true; 
			
			while(j < numbers[i]){
				if (numbers[i] % j == 0){
					flag = false;
					break;
				}
				j++;
			}
			
			if (flag){
				ans++;
			}
			
		}
		
		System.out.println(ans);
		
	}
	
}