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 l,x,i,j,k=0;
  
  scanf("%d",&l);

  for(i=0;i<l;i++)
    {
      scanf("%d",&x);
      
      for(j=2;j<=sqrt(x);j++)
	{
	  if(x%j==0){ k++; break;}
	}
      
    }
  
  printf("%d\n",l-k);

  return 0;
}