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: Time Limit Exceeded)

/*素数判定*/
#include <stdio.h>
#define N 1000
int main(){
  int i, j, n, count=0, a[N], f;

  /*nを入力*/
  scanf("%d", &n);
  
  /*n個の整数入力*/
  for (i=0; i<n; i++){
    f=0;
    scanf("%d", &a[i]);
    /*素数をカウント*/
    for (j=2; j<a[i]/2+1; j++){
      if (a[i]%j==0 || a[i]==1) f=1;
    }
    if (!f) count++;
  }
    
  printf("%d\n", count);
  
  return 0;
  }