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
fscanf(STDIN, '%d', $cnt);
$nums = array_map('intval', explode(' ', trim(fgets(STDIN))));
$ans = 0;
for ($i=0; $i < $cnt; $i++) { 
    if ($i % 2 == 0 && $nums[$i] & 2 != 0) {
        $ans++;
    }
}
echo $ans;