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 Ruby (2.7.1) (judge verdict: Runtime Error)

line = readlines.map(&:chomp)
# line = ["5", "1 3 4 5 7"]

n = line[0].to_i
# n = 5
array = line[1].split(" ").map(&:to_i)
# array = [1, 3, 4, 5, 7]

result_count = 0

(1..n).each do |num|
  if num % 2 === 1
    if array[num] % 2 === 1
      result_count += 1
    end
  end
end

puts result_count