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>
int iP(int);
int main(){
  int n,a,b,i,count=0;
  scanf("%d",&n);
  for(i=0;i<n;i++){
    scanf("%d",&a);
    b=iP(a);
    if(b==1)count++;
  }
  printf("%d\n",count);
}
int iP(int a){
  int i;
  if(a<2)return 0;
  for(i=2;i*i<=a;i++){
    if(a%i==0)return 0;
  }
  return 1;
}