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 (GCC 9.2.1) (judge verdict: Accepted)

//incorrect

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#define rep(i,l) for(int i = 0; i < l; i++)

int nextint(void){int n;scanf("%d",&n);return n;}

int main(void){

    int n = nextint();
    int ans=0;

    rep(i,n){
        int k=nextint();
        if(((i+1)*k)%2!=0)ans++;
    }

    printf("%d",ans);

    return 0;
}