Problem:
Score : 200 points

Problem Statement

We have N squares assigned the numbers 1,2,3,\ldots,N. Each square has an integer written on it, and the integer written on Square i is a_i.

How many squares i satisfy both of the following conditions?

The assigned number, i, is odd.

The written integer is odd.

Constraints

All values in input are integers.

1 \leq N, a_i \leq 100

Input

Input is given from Standard Input in the following format:

N
a_1 a_2 \cdots a_N

Output

Print the number of squares that satisfy both of the conditions.

Sample Input 1

5
1 3 4 5 7

Sample Output 1

2

Two squares, Square 1 and 5, satisfy both of the conditions.

For Square 2 and 4, the assigned numbers are not odd.

For Square 3, the written integer is not odd.

Sample Input 2

15
13 76 46 15 50 98 93 77 31 43 84 90 6 24 14

Sample Output 2

3

Solution in PHP (7.4.4) (judge verdict: Accepted)

<?php
// From https://qiita.com/yoshikyoto/items/6924478283dbdd549e4b
class Scanner
{
    private $arr = [];
    private $count = 0;
    private $pointer = 0;
    public function next()
    {
        if ($this->pointer >= $this->count) {
            $str = trim(fgets(STDIN));
            $this->arr = explode(' ', $str);
            $this->count = count($this->arr);
            $this->pointer = 0;
        }
        $result = $this->arr[$this->pointer];
        $this->pointer++;
        return $result;
    }
    public function hasNext()
    {
        return $this->pointer < $this->count;
    }
    public function nextInt()
    {
        return (int)$this->next();
    }
    public function nextDouble()
    {
        return (float)$this->next();
    }
}
// From https://qiita.com/yoshikyoto/items/6924478283dbdd549e4b
list($N) = sscanf(trim(fgets(STDIN)), "%d");

$sc = new Scanner();
$cnt = 0;
for ($i = 1; $i <= $N; $i++) {
    $n = $sc->nextInt();
    if(($i % 2 == 1) && ($n % 2 == 1)){
        $cnt++;
    }
}
print($cnt);