def divisors(n):
    # Write your code here
    if n%2 == 1:
        return 0
    
    ans = 0
    n = int(n/2)
    for i in range(1, int(math.sqrt(n)+1)):
        if n % i == 0 and i**2 != n:
            ans += 2
        if i**2 == n:
            ans += 1
    return ans