import java.util.Scanner;
public class Main{

private static Scanner scanner;

public static void main(String args[])
{
	scanner = new Scanner(System.in);
	int a = scanner.nextInt();
	int[] b = new int[a];
	int count = 0,pre = 0;

	for(int i = 0;i < a;i++) {
		b[i] = scanner.nextInt();
		for(int j = 2;j <= Math.sqrt(b[i]);j++) {
			if(b[i]%j == 0) {
				count++;
				break;
			}
		}
		if(count == 0) {
			pre++;
		}
		count = 0;
	}
	System.out.println(pre);
}
}

/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