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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {
	
	private static Scanner sc;
	
	public static void main (String args[]) {
		sc = new Scanner(System.in);
		//マスの数(1～100の範囲)
		int n = Integer.parseInt(sc.next());
		int result = 0;
		//マスに入っている値
		for(int i = 0; i < n; i++) {
			int der1 = i%2;
			int a = Integer.parseInt(sc.next());
			int der2 = a%2;
			if (der1==0 && der2==1) {
				result++;
			}
		}
		System.out.println(result);
	}	
}