using System;

namespace ALDS1_1_C_PrimeNumbers
{
	class Program
	{
		static void Main ( string[] args )
		{
			int dataCount = int.Parse (Console.ReadLine ());

			int count = 0;

			for (int lp = 0; lp < dataCount; lp++)
			{
				int inputNum = int.Parse (Console.ReadLine ());
				if (IsPrimeNumber (inputNum))
					count++;
			}

			Console.WriteLine (count);
		}

		static bool IsPrimeNumber ( int num )
		{
			if (num < 2)
				return false;

			if (num == 2)
				return true;

			if (num % 2 == 0)
				return false;

			int lp = 3;
			double limit = Math.Sqrt (num);
			while (lp < limit)
			{
				if (num % lp == 0)
					return false;

				lp += 2;
			}

			return true;
		}
	}
}