Problem:
Prime Numbers

A prime number is a natural number which has exactly two distinct natural number divisors: 1 and itself. For example, the first four prime numbers are: 2, 3, 5 and 7.

Write a program which reads a list of N integers and prints the number of prime numbers in the list.

Input

The first line contains an integer N, the number of elements in the list.

N numbers are given in the following lines.

Output

Print the number of prime numbers in the given list.

Constraints

1 ≤ N ≤ 10000

2 ≤ an element of the list ≤ 108

Sample Input 1

5
2
3
4
5
6

Sample Output 1

3

Sample Input 2

11
7
8
9
10
11
12
13
14
15
16
17

Sample Output 2

4

Solution in C# (judge verdict: Wrong Answer)

using System;

namespace ALDS1_1_C
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();
            int n = int.Parse(str);
            int Ans = 0;
            for (int i = 0; i < n; ++i)
            {
                string str1 = Console.ReadLine();
                int x = int.Parse(str1);
                if (CheckPrime(x))
                {
                    Ans += 1;
                }

            }

            Console.WriteLine("{0}", Ans);
        }

        static private bool CheckPrime(int x)
        {
            for (int i = 2; (i^2) < x; ++i)
            {
                if (x % i == 0)
                {
                    return false;
                }
            }
            return true;
        }
    }
}