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: Accepted)

n = gets.chomp.to_i
a = gets.chomp.split(' ').map(&:to_i)
arr = []
i = 1
while i <= n
  arr << [i,a[i-1]]
  i += 1
end
# p arr

# count
c = 0
i = 0
while i < n
  if (arr[i][0]%2 != 0) && (arr[i][1]%2 !=0)
    # p "a[][]:#{a[i]}"
    c += 1
  end
  i += 1
end

puts c