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.Collections.Generic;
using System.Text;

class Program
{
	static void Main(string[] args)
	{
		string[] input = Read();
		int n = int.Parse(input[0]);
		input = Read();
		int cnt = 0;
		for(int i=0; i<n; i++) 
		{
			int a = int.Parse(input[i]);
			if(i%2==0 && a%2!=0) cnt++;
		}
		Write(cnt);
	}

	static string[] Read()
	{
		return Console.ReadLine().Split(' ');
	}

	static void Write(object o)
	{
		Console.WriteLine(o.ToString());
	}
}