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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Linq;

namespace Aisingcontest2020
{
    class Program
    {
        static void Main(string[] args)
        {
            b();
        }

        public static void b()
        {
            int n = int.Parse(Console.ReadLine());
            int[] a = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            int sum = 0;
            for(int i = 0; i < n; i++)
            {
                if(i % 2 == 0 && a[i] % 2 == 1)
                { sum++; }
            }
            Console.WriteLine(sum);
        }
    }
}