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++ (Clang 10.0.0) (judge verdict: Accepted)

#include <iostream>

namespace NS20200711Acing
{

  class AnOddProblem final
  {
  public:
    AnOddProblem() = default;
    ~AnOddProblem() = default;

  public:
    void Run()
    {
      Input();
      Calc();
      Output();
    }

    void Input()
    {

      std::cin >> m_N;
      for (int i = 0; i < m_N; ++i)
      {
        std::cin >> m_A[i];
      }
    }

    void Calc()
    {
      for(int i=0;i<m_N;i+=2)
      {
        if((m_A[i] & 0x1) == 1) m_answer++;
      }
    }

    void Output()
    {
      std::cout << m_answer << std::endl;
    }

  private:
    static const int N_MAX = 100;
    int m_N;
    int m_A[N_MAX] = {};
    int m_answer = 0;
  };

}

int main()
{
  NS20200711Acing::AnOddProblem prob;
  prob.Run();

  return 0;
}