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: Accepted)

#include<stdio.h>
#include<math.h>
int main()
{
  int n, num, sum = 0, i, j;
  scanf("%d", &n);
  for(i = 0; i < n; i++)
    {
      scanf("%d", &num);
      if(num % 2 == 0 && num > 2)
	{
	  sum++;
	}
      else
	{
	  for(j = 3; j <= sqrt(num); j+=2)
	    {
	      if(num % j == 0)
		{
		  sum++;
		  break;
		}
	    }
	}
    }
  printf("%d\n", n - sum);
  return 0;
}