using System;
//using System.Collections.Generic;
//using System.Collections;
//using System.Linq;

namespace solution
{
  class Class1
  {
    static void Main()
    {
      int n = int.Parse(Console.ReadLine());
      int count = 0;

      for (int i = 0; i < n; i++)
      {
        int x = int.Parse(Console.ReadLine());

        if (PrimeCheck(x) == true) count++;

      }
      Console.WriteLine(count);
    }

    static bool PrimeCheck(int x)
    {
      if (x == 2) return true;
      if (x % 2 == 0) return false;
      for (int i = 3; i < Math.Sqrt(x); i += 2)
      {
        if (x % i == 0) return false;
      }
      return true;
    }
  }
}






