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 OCaml (4.10.0) (judge verdict: Accepted)

open Printf
open Scanf

let id x = x

let n = scanf "%d"id
let ns = Array.init n (fun _ -> scanf " %d" id)

let run () =
    let result = ref 0 in
    for i = 0 to n - 1 do
        if (i + 1) mod 2 = 1 && ns.(i) mod 2 = 1 then incr result
    done;
    printf "%d\n" !result

let () = run ()