Jack really likes his number five: the trick here is that you have to multiply each number by 5 raised to the number of digits of each numbers, so, for example:
```python
multiply(3)==15
multiply(10)==250
multiply(200)==25000
multiply(0)==0
multiply(-3)==-15
```

Difficulty: EASY
Tags: Fundamentals

Starter code:
def multiply(n):
	

Solutions:
def multiply(n):
	return n * 5 ** len(str(abs(n)))


multiply = lambda n: n * 5 ** len(str(abs(n)))


def multiply(n):
	return n * 5 ** number_of_digits(n)

def number_of_digits(n: int):
	return 1 if -10 < n < 10 else 1 + number_of_digits(n // 10)


def multiply(n):
	return n * 5 ** int_len(n)

def int_len(n):
	n = abs(n)
	length = 0
	while n:
		length += 1
		n //= 10
	return length


from math import log10

def multiply(n):
	return n * 5 ** int(log10(abs(n)) + 1) if n != 0 else 0


import math

def multiply(n):
	dig_count = int(math.log10(abs(n)) + 1) if n else 1
	return n * 5 ** dig_count


def multiply(n: int) -> int:
	return n * pow(5, len(str(abs(n))))


def multiply(n):
	nDigits = len(str(abs(n)))
	print(nDigits)
	return n * 5 ** nDigits


def multiply(n):
	n = str(n)
	if int(n) < 0:
		return int(n) * 5 ** (len(n) - 1)
	else:
		return int(n) * 5 ** len(n)


def multiply(n):
	for x in range(len(str(n))):
		n *= 5
	return n if n > 0 else n / 5


def multiply(n):
	return n * 5 ** len([i for i in str(n) if i.isdigit()])


def multiply(n):
	return n * 5 ** len(str(n).replace('-', ''))


def multiply(n):
	s = str(n).lstrip('-')
	return n * 5 ** len(s)


def multiply(n):
	s = str(n)
	factor = len(s)
	if n > 0:
		return n * 5 ** factor
	else:
		return n * 5 ** (factor - 1)


def multiply(n):
	i = 10
	j = 1
	while True:
		if abs(n) < i:
			return n * 5 ** j
		else:
			i *= 10
			j += 1


import math

def multiply(n):
	if n > 0:
		digits = int(math.log10(n)) + 1
	elif n == 0:
		digits = 1
	else:
		digits = int(math.log10(-n)) + 2
	if n > 0:
		return 5 ** digits * n
	else:
		return 5 ** (digits - 1) * n


def multiply(n):
	for x in range(1, len(str(abs(n))) + 1):
		n *= 5
	return n


def multiply(n):
	x = len(str(n).lstrip('-').replace('.', ''))
	return n * 5 ** x


def multiply(n):
	return n * pow(5, len(str(n)) - 1) if n < 0 else n * pow(5, len(str(n)))


def multiply(n):
	if n >= 0:
		a = str(n)
		return n * 5 ** len(a)
	elif n < 0:
		a = str(n)
		return n * 5 ** (len(a) - 1)


def multiply(n):
	m = 5 ** len(str(n)) if n >= 0 else 5 ** len(str(-n))
	return n * m


def multiply(n):
	n_multiply = len(str(n).strip('-'))
	for i in range(n_multiply):
		n = n * 5
	return n


def multiply(n):
	res = 5 ** len(str(abs(n))) * abs(n)
	return res if n > 0 else -res


def multiply(n):
	if '-' in str(n):
		i = len(str(n)) - 1
	else:
		i = len(str(n))
	return n * 5 ** i


def multiply(n):
	l = len(str(n))
	if n == 0:
		return 0
	if n > 0:
		return n * 5 ** l
	if n < 0:
		return n * 5 ** (l - 1)


def multiply(n):
	if n == 0:
		return 0
	elif n > 0:
		exp = len(str(n))
		return n * 5 ** exp
	else:
		exp = len(str(-n))
		return n * 5 ** exp


def multiply(n):
	if n < 0:
		x = str(n).replace('-', '')
		y = len(x)
		return n * 5 ** y
	else:
		return n * 5 ** len(str(n))


multiply = lambda N, X=5: N * X ** len(str(N)[1 if N < 0 else 0:])


def multiply(n):
	nd = len(str(n))
	for i in range(nd):
		n *= 5
	return n if n > 0 else n // 5


def multiply(n):
	return 5 ** len(str(n)[1:]) * n if str(n).startswith('-') else 5 ** len(str(n)) * n


def multiply(n):
	account = 0
	for value in str(abs(n)):
		account += 1
	return n * 5 ** account


def multiply(n):
	print(n)
	return 5 ** len(str(n)) * n if n > 0 else 5 ** (len(str(n)) - 1) * n


def multiply(n):
	a = len(str(n))
	if n > 0:
		return n * 5 ** a
	else:
		return n * 5 ** (a - 1)


def multiply(n):
	minus = False
	if n < 0:
		minus = True
		n *= -1
	n *= 5 ** len(str(n))
	if minus:
		n *= -1
	return n


def multiply(n):
	count = len(str(n))
	if n >= 0:
		return n * 5 ** count
	else:
		return n * 5 ** (count - 1)


def multiply(n):
	return n * 5 ** len(list(str(n))) if n > 0 else n * 5 ** len(list(str(n * -1)))


def multiply(n):
	absolute = abs(n)
	new = str(absolute)
	length = len(new)
	integer = int(length)
	return n * 5 ** integer


def multiply(n):
	if n >= 0:
		b = 5 ** len(str(n))
		return n * b
	elif n < 0:
		n = abs(n)
		b = 5 ** len(str(n))
		return -abs(n * b)


def multiply(n):
	l = len(str(n))
	lm = len(str(n)) - 1
	if str(n).startswith('-'):
		return n * 5 ** lm
	else:
		return n * 5 ** l


def multiply(n):
	if n > 0:
		multiplier = 5 ** len(str(n))
		operation = n * multiplier
		return operation
	else:
		convert = abs(n)
		mn = 5 ** len(str(convert))
		on = n * mn
		return on


def multiply(n):
	a = str(n)
	l = []
	d = 5
	for x in a:
		l.append(x)
	if n > 0:
		for x in range(0, len(l)):
			n = n * 5
	if n < 0:
		for x in range(0, len(l) - 1):
			n = n * 5
	return n


import math

def multiply(n):
	length = len(str(abs(n)))
	return n * 5 ** length


def multiply(n):
	power = len(str(n))
	if n > 0:
		return n * 5 ** power
	if n < 0:
		power = len(str(n)) - 1
		return n * 5 ** power
	else:
		return 0


def multiply(n):
	a = []
	if n < 0:
		a2 = str(n)
		a3 = len(a2)
		a4 = a3 - 1
	if n > 0:
		d = str(n)
		c = len(d)
	if n == 0:
		return 0
	elif n < 0:
		return 5 ** a4 * n
	elif n > 0:
		return 5 ** c * n


def multiply(n):
	return n * 5 ** len(list(filter(str.isdigit, str(n))))


def multiply(n):
	return n * 5 ** len(str(n)) if '-' not in str(n) else n * 5 ** (len(str(n)) - 1)


def multiply(n):
	num = len(str(n))
	if n < 0:
		num -= 1
	return n * 5 ** num


def multiply(n):
	if n >= 0:
		return n * 5 ** len(str(n))
	else:
		return n * 5 ** len(str(n).replace('-', ''))


import math

def multiply(n):
	sum = n * 5
	digits = len(str(n))
	if n < 0:
		digits = digits - 1
	for x in range(digits - 1):
		sum = sum * 5
	return sum


def multiply(n):
	p = len(str(abs(n)))
	ans = n * 5 ** p
	return ans


def multiply(n):
	x = len(str(n).strip('-'))
	return n * 5 ** x


def multiply(n):
	c = 0
	for i in str(n):
		for j in i:
			if j.isdigit():
				c += 1
	five = 1
	while c != 0:
		c -= 1
		five *= 5
	return five * n


def multiply(n):
	copy = str(n)
	length = len(copy)
	if n < 0:
		length = length - 1
	return n * 5 ** length


def multiply(n):
	(t, flag) = (n, False) if n > 0 else (abs(n), True)
	res = n * 5 ** len(str(t))
	return res


def multiply(n):
	count = 0
	if n < 0:
		num = -n
	else:
		num = n
	while num > 0:
		num = num // 10
		count += 1
	return n * 5 ** count


def multiply(n):
	digits = len(list(str(n).lstrip('-')))
	return n * 5 ** digits


def multiply(n):
	return n * 5 ** (lambda n: len(str(n)) if n >= 0 else len(str(n)) - 1)(n)


def get_digit_count(n):
	digits = 0
	while 0 < n:
		n //= 10
		digits += 1
	return digits

def multiply(n):
	return n * 5 ** get_digit_count(abs(n))


def multiply(n):
	l = str(n)
	a = ''
	for c in l:
		if c in '0123456789':
			a += c
	return n * 5 ** len(a)


def multiply(n):
	s = len(str(abs(n)))
	p = 5 ** s
	return n * p


from math import fabs

def multiply(n):
	return n * 5 ** len(str(int(fabs(n))))


def multiply(n):
	check = str(n)
	check = check.replace('-', '')
	num = len(check)
	return 5 ** num * n