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 Haskell (GHC 8.8.3) (judge verdict: Accepted)


--{-# LANGUAGE StandaloneDeriving #-}
--{-# LANGUAGE BangPatterns #-}

module Main where

import Debug.Trace
--import Data.List
--import Data.Char
--import qualified Data.Set.Strict as Set
--import qualified Data.Map.Strict as Map

main :: IO ()
main = do
  getLine
  a <- map read . words <$> getLine
  --a `traceShow`
  print $ solve a

solve :: [Int] -> Int
solve a = length . filter (\(i, ai) -> i `mod` 2 == 1 && ai `mod` 2 == 1) . zip [1..] $ a