# Task
 You have set an alarm for some of the week days.
 
 Days of the week are encoded in binary representation like this:
```
0000001 - Sunday
0000010 - Monday
0000100 - Tuesday
0001000 - Wednesday
0010000 - Thursday
0100000 - Friday 
1000000 - Saturday```
For example, if your alarm is set only for Sunday and Friday, the representation will be `0100001`. 

 Given the current day of the week, your task is to find the day of the week when alarm will ring next time.

# Example

 For `currentDay = 4, availableWeekDays = 42`, the result should be `6`.
 
 ```
currentDay = 4 means the current Day is Wednesday
availableWeekDays = 42 convert to binary is "0101010"
So the next day is 6 (Friday)
```

# Input/Output


 - `[input]` integer `currentDay`
 
 The weekdays range from 1 to 7, 1 is Sunday and 7 is Saturday


 - `[input]` integer `availableWeekDays`
 
 An integer. Days of the week are encoded in its binary representation.


 - `[output]` an integer

 The next day available.

Difficulty: EASY
Starter code: def next_day_of_week(current_day, available_week_days):
	

Solutions:
def next_day_of_week(current_day, available_week_days):
	x = 2 ** current_day
	while not x & available_week_days:
		x = max(1, x * 2 % 2 ** 7)
	return x.bit_length()


def next_day_of_week(c, a):
	return next(((weekday - 1) % 7 + 1 for weekday in range(c + 1, c + 8) if 1 << (weekday - 1) % 7 & a))


def next_day_of_week(current_day, available_week_days):
	b = f'{available_week_days:07b}'[::-1]
	return b.find('1', current_day) + 1 or b.index('1') + 1


def next_day_of_week(a, b):
	return (f'{b:7b}'[::-1] * 2).index('1', a) % 7 + 1


def next_day_of_week(current_day, available_week_days):
	d = {1: 1, 2: 2, 3: 4, 4: 8, 5: 16, 6: 32, 7: 64}
	while True:
		if current_day == 7:
			current_day = 0
		current_day += 1
		if available_week_days & d[current_day]:
			return current_day


def next_day_of_week(current_day, available_week_days):
	return (f'{available_week_days:07b}'[::-1] * 2).index('1', current_day) % 7 + 1


next_day_of_week = lambda n, b: next((i % 7 + 1 for i in range(n, n + 8) if 1 << i % 7 & b))


def next_day_of_week(day, week):
	days = [d for (d, v) in enumerate(bin(week)[2:][::-1], 1) if int(v)]
	return next((d for d in days if d > day), days[0])


def next_day_of_week(d, a):
	t = a & ~((1 << d) - 1) or a
	return (t & -t).bit_length()


from math import log

def next_day_of_week(current_day, available_week_days):
	code = bin(available_week_days)[2:].rjust(7, '0')[::-1]
	for i in range(current_day, 7):
		if code[i] == '1':
			return i + 1
	for i in range(current_day):
		if code[i] == '1':
			return i + 1