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)

#include<stdio.h>
#include<math.h>
int Sosu(int N){
  int i=3;
if(N==2)return 1;
if(N<2 || N%2==0)return 0;
while(i<=sqrt(N)){
  if(N%i==0)return 0;
}
return 1;
}
int main(void){
int N;
int n,i;
int S=0,c=0;
while(1){
scanf("%d",&n);
if(n>=1 && n<=10000)break;
}
for(i=0 ; i<n ; i++){
  while(1){
  scanf("%d",&N);
  if(N>=2 && N<=100000000)break;
  }
  S+=Sosu(N);
}
printf("%d\n",S);
return 0;
}