## Task

Given a positive integer `n`, calculate the following sum: 

```
n + n/2 + n/4 + n/8 + ...
``` 

All elements of the sum are the results of integer division.

## Example

```
25  =>  25 + 12 + 6 + 3 + 1 = 47
```

Difficulty: EASY

Starter code:
def halving_sum(n):
	

Solutions:
def halving_sum(n):
	s = 0
	while n:
		s += n
		n >>= 1
	return s


def halving_sum(n):
	if n == 1:
		return 1
	else:
		return n + halving_sum(n // 2)


def halving_sum(n):
	return n and n + halving_sum(n >> 1)


def halving_sum(n):
	result = n
	while n >= 1:
		n //= 2
		result += n
	return result


import math

def halving_sum(n):
	return sum((n // 2 ** x for x in range(int(math.log2(n)) + 1)))


def halving_sum(n):
	return n + halving_sum(n // 2) if n else 0


def halving_sum(n):
	L = [n]
	for i in range(1, n + 1):
		a = n // 2 ** i
		if a not in L:
			L.append(a)
	return sum(L)


def halving_sum(n):
	r = 0
	while n:
		r += n
		n >>= 1
	return r


def halving_sum(n):
	divisor = 1
	addends = []
	addend = n // divisor
	while addend > 0:
		addends.append(addend)
		divisor *= 2
		addend = n // divisor
	return sum(addends)


def halving_sum(n):
	re = n
	while n > 1:
		n = n // 2
		re += n
	return re


def halving_sum(n):
	b = n // 2
	c = []
	c.append(n)
	c.append(b)
	for i in range(0, n):
		b = b // 2
		c.append(b)
	return sum(c)


def halving_sum(n):
	total = 0
	while True:
		if n == 0:
			break
		else:
			total += n
			n = n // 2
	return total


def halving_sum(n):
	sum = 0
	while n != 1:
		sum = sum + n
		n = n // 2
	return sum + 1


def halving_sum(n):
	result = n
	if n < 1:
		return n
	else:
		while n > 1:
			result += n // 2
			n = n // 2
		return result
print(halving_sum(25))


def halving_sum(n):
	result = 0
	while n:
		result += n
		n //= 2
	return result


def halving_sum(n):
	return sum((n // 2 ** i for i in range(14)))


def halving_sum(n):
	total = n
	while n > 0:
		n //= 2
		total += n
	return total


def square_gen(n):
	x = 1
	while x <= n:
		yield x
		x *= 2

def halving_sum(n):
	return sum([int(n / i) for i in square_gen(n)])


import math

def halving_sum(n):
	counter = 0
	div = n
	result = 0
	while div >= 1:
		div = math.floor(n / 2 ** counter)
		counter += 1
		result += div
	return result


def halving_sum(n):
	return sum((n >> i for i in range(15)))


def halving_sum(n):
	cnt = 2
	s = n
	while n // cnt > 0:
		s += n // cnt
		cnt *= 2
	return s


def halving_sum(n):
	my_list = []
	while n:
		my_list.append(n)
		n = n // 2
	return sum(my_list)


import math

def halving_sum(n):
	return sum([n // 2 ** i for i in range(math.ceil(math.log(n, 2)))]) if n > 1 else 1


def halving_sum(n):
	add = n
	while n > 1:
		n = n // 2
		add += n
	return add


def halving_sum(n):
	summa = 0
	while n != 1:
		summa += n
		n = n // 2
	return summa + 1


def halving_sum(n):
	tot = 0
	while n != 1:
		tot += n
		n = n // 2
	return tot + 1


def halving_sum(n):
	m = n
	summ = 0
	count = 1
	while n // count >= 1:
		summ += n // count
		count *= 2
	return summ


import math

def halving_sum(n):
	half = n / 2
	if half <= 1:
		return math.ceil(half)
	else:
		return math.floor(n + halving_sum(half))


def halving_sum(n):
	hold = 0
	x = 1
	while n // x > 0:
		hold += n // x
		x *= 2
	return hold


import math

def halving_sum(n):
	if n < 1:
		return 0
	elif n == 1:
		return 1
	return math.floor(n) + halving_sum(n / 2)


def halving_sum(n):
	res = n
	while n != 1:
		n = int(n / 2)
		res += n
	return res


def halving_sum(n):
	print(n)
	i = 1
	suma = 0
	resultado = 0
	while i < n:
		suma = n / i
		print(int(suma))
		resultado = resultado + int(suma)
		i *= 2
	if int(resultado) == 0:
		resultado = 1
		return int(resultado)
	else:
		print(int(resultado))
		return int(resultado)


def halving_sum(n):
	a = 1
	b = 0
	while n // a != 1:
		b = b + n // a
		a = a * 2
	return b + 1


def halving_sum(n):
	sum = n
	while True:
		if n // 2 == 0:
			break
		else:
			n = n // 2
		sum += n
	return sum


def halving_sum(n):
	a = [n]
	b = n
	while n > 1:
		c = n // 2
		a.append(c)
		b += c
		n = c
	return b


from itertools import takewhile, count

def halving_sum(n):
	return sum(takewhile(lambda x: x >= 1, map(lambda y: n // 2 ** y, count())))


def halving_sum(n):
	sm = 0
	while n > 0:
		sm += n
		n //= 2
	return sm


def halving_sum(n):
	start = n
	total = 0
	while start >= 1:
		total += start
		start = int(start / 2)
	return total


import math

def halving_sum(n):
	ne = 1
	while n > 1:
		ne += n
		n = n / 2
		n = math.floor(n)
	return ne


def halving_sum(n):
	k = n
	t = n
	while k > 0:
		k = int(k / 2)
		t += k
	return t


def halving_sum(n):
	suma = 0
	sumando = n
	while sumando >= 1:
		suma = suma + sumando
		sumando = sumando // 2
	return suma


def halving_sum(n):
	(i, sum) = (2, n)
	while i <= n:
		sum += n // i
		i += i
	return sum


def halving_sum(n):
	summed = 0
	x = 1
	while n // x > 0:
		summed += n // x
		x *= 2
	return summed


def halving_sum(n):
	sum = 0
	if n >= 1:
		sum += n + halving_sum(n // 2)
	return sum


def halving_sum(n):
	a = []
	for i in range(n):
		a.append(n)
		n = int(n / 2)
		if int(n) >= 1:
			pass
		else:
			break
	return sum(a)


def halving_sum(n):
	r = n
	while n > 0:
		n //= 2
		r += n
	return r


def halving_sum(n):
	running_total = 0
	while n > 0:
		running_total += n
		n = n // 2
	return running_total


def halving_sum(n):
	div = 2
	total = n
	while n // div:
		total += n // div
		div *= 2
	return total


def halving_sum(n):
	sum = n
	divide = n
	while divide // 2:
		divide = divide // 2
		sum += divide
	return sum


def halving_sum(n):
	sm = 0
	i = 0
	while n // 2 ** i > 0:
		sm += n // 2 ** i
		i += 1
	return sm


def halving_sum(number):
	n = number
	while number != 1:
		number = number // 2
		n += number
	return n


def halving_sum(n):
	sum_list = []
	sum_int = 0
	sum_list.append(int(n))
	while n != 1:
		sum_list.append(int(n) // 2)
		n = int(n) // 2
	for q in range(len(sum_list)):
		sum_int = sum_int + sum_list[q]
	return sum_int


def halving_sum(n):
	l = 0
	while n != 1:
		l += n
		n = n // 2
	return l + 1


def halving_sum(n):
	output = 0
	while n > 0:
		output += n
		n //= 2
	return output


def halving_sum(n):
	half = 0
	while n > 1:
		half += n
		n = n // 2
	return half + 1


def halving_sum(n):
	i = 0
	x = 0
	while True:
		if n // 2 ** i > 0:
			x = x + n // 2 ** i
			i = i + 1
		else:
			break
	return x


def halving_sum(n):
	return 1 if n == 1 else sum([n // 2 ** i for i in range(0, n // 2) if n // 2 ** i >= 1])


import math

def halving_sum(n):
	return 1 if n == 1 else sum([math.floor(n / 2 ** i) for i in range(0, math.floor(n / 2)) if math.floor(n / 2 ** i) >= 1])


def halving_sum(n):
	m = 0
	while n >= 1:
		m += n
		n //= 2
	return m


def halving_sum(n):
	sums = []
	nums = n
	while nums > 0:
		sums.append(nums)
		nums = int(nums / 2)
		if nums <= 0:
			break
	return sum(sums)


def halving_sum(n):
	b = 1
	top = 0
	while b <= n:
		top += int(n / b)
		b *= 2
	return top


def halving_sum(n):
	total = n
	divisor = 2
	while n // divisor > 0:
		if n // divisor == 1:
			total += 1
			break
		else:
			total += n // divisor
			divisor *= 2
	return total


def halving_sum(n):
	res = 0
	while n > 1:
		res = res + n
		n = n // 2
	return res + 1


def halving_sum(n):
	c = 0
	while n >= 1:
		c = c + n
		n = n // 2
	return c


from itertools import count, takewhile

def halving_sum(n):
	g = (2 ** j for j in count(0))
	g = takewhile(lambda x: n >= x, g)
	return sum((n // i for i in g))


import unittest

def halving_sum(n):
	temp = []
	while True:
		if n == 1:
			break
		temp.append(n)
		n = n // 2
	return sum(temp) + 1

class TestHalvingSum(unittest.TestCase):

	def test_halving_sum_when_given_n_is_25(self):
		n = 25
		actual = halving_sum(n)
		self.assertEqual(actual, 47)

	def test_halving_sum_when_given_n_is_127(self):
		n = 127
		actual = halving_sum(n)
		self.assertEqual(actual, 247)


import math

def halving_sum(n):
	a = 0
	d = 1
	res = 0
	while a != 1:
		a = math.floor(n / d)
		d *= 2
		res += a
	return res


def halving_sum(n):
	delit = 2
	sum = n
	while n > 0:
		n = n // delit
		delit * 2
		sum += n
	return sum


import math

def halving_sum(n):
	accum = 0
	while n > 0:
		accum += n
		n = math.floor(n / 2)
	return accum


from math import trunc

def halving_sum(n):
	result = divided = n
	divisor = 1
	while divided > 1:
		divisor *= 2
		divided = n // divisor
		result += divided
	return result


def halving_sum(n):
	x = n
	while n != 1:
		x += n // 2
		n //= 2
	return x


def halving_sum(n):
	a = 0
	while n >= 1:
		a += n
		n *= 1 / 2
		n = int(n)
	return a


import math

def halving_sum(n):
	number = n
	while number >= 1:
		n += math.floor(number / 2)
		number /= 2
	return n


import math

def halving_sum(n):
	score = 0
	while n >= 1:
		score += n
		n = math.floor(n * 1 / 2)
	return score


def halving_sum(n):
	total_sum = n
	while n != 1:
		n = n // 2
		total_sum += n
	return total_sum


def halving_sum(n):
	answer = 0
	while n > 0:
		answer += n
		n = n // 2
	return answer


def halving_sum(n):
	x = 2
	sol = n
	while n // x > 0:
		sol = sol + n // x
		x *= 2
	return sol