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;
using System.Collections;
using System.Collections.Generic;
using System.Linq.Expressions;

namespace Main
{
    class Program
    {
        static void Main(string[] args)
        {
            //ここから
            //int n=Readint();
            //string[] str = Console.ReadLine().Split(' ');

            int n = Readint();
            string[] str = Console.ReadLine().Split(' ');

            int count = 0;
            for(int i=0;i<n;i++)
            {
                if (i % 2 == 0 && int.Parse(str[i]) % 2 == 1) count++;
            }

            Cout(count);
            //ここまで
        }

        static void Cout(string s)
        {
            Console.WriteLine(s);
            return;
        }

        static void Cout(int n)
        {
            Console.WriteLine(n);
            return;
        }

        static void Cout(long n)
        {
            Console.WriteLine(n);
            return;
        }

        static int Readint()
        {
            return int.Parse(Console.ReadLine());
        }

        static int[] ReadArray(int n)
        {
            string[] str = Console.ReadLine().Split(' ');
            int[] a = new int[n];
            for (int i=0; i < n; i++){ a[i] = int.Parse(str[i]); }
            return a;
        }
        static long[] ReadArray(long n)
        {
            string[] str = Console.ReadLine().Split(' ');
           long[] a = new long[n];
            for (long i = 0; i < n; i++) { a[i] = long.Parse(str[i]); }
            return a;
        }

        static long Readlong()
        {
            return long.Parse(Console.ReadLine());
        }

        static int Min(int a, int b)
        {
            if (a < b) return a;
            return b;
        }

        static int Max(int a, int b)
        {
            if (a > b) return a;
            return b;
        }


    }

}