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 Rust (1.42.0) (judge verdict: Accepted)

// https://atcoder.jp/contests/aising2020/tasks/aising2020_b

use proconio::fastout;
use proconio::input;

#[fastout]
fn main() {
    input! {
        n: usize,
        a_n: [i64; n],
    }
    let mut ans = 0;
    for (i, x) in a_n.iter().enumerate() {
        if (i + 1) % 2 != 0 && x % 2 != 0 {
            ans += 1;
        }
    }
    println!("{}", ans);
}