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

int oddSum(int arr[], int n)
{
    if (n == 0)
        return arr[0];
    else if ((n-1) % 2 == 1)
        return arr[n] + oddSum(arr,n-1);
    else
        return oddSum(arr,n-1);
}

int main()
{
    int arr[3];
    arr[0]=3; arr[1]=4; arr[2]=7; arr[3]=1;
    printf("%d\n", oddSum(arr,3));

    return 0;
}