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 JavaScript (judge verdict: Accepted)

(() => {

    var lines = [];

    require('readline').createInterface({
        input: process.stdin,
    }).on('line', (line) => {
        lines.push(parseInt(line, 10));
    });

    process.stdin.on("end", function(){
        console.log(lines.filter(isPrime).length);
    });

    const isPrime = function(x){
        if(x == 2){
            return true;
        }

        if(x < 2 || (x & 0x01) === 0){
            return false;
        }

        const sqrt_x = Math.sqrt(x);
        for(let i = 3; i <= sqrt_x; i+=2){
            if(x % i === 0){
                return false;
            }
        }
        return true;
    }


})();