



'''simple docstring'''

from __future__ import annotations







def     __UpperCamelCase					(				_lowercase       )			->      bool:
	_lowercase       :							int
	_lowercase       :							list[str]  	=		list(_lowercase       )
	_lowercase	,     _lowercase       :							List[Any]  	=		_vector[:-1], int(_vector[-1]       )
	_lowercase       :							list[int]  	=		[int(_lowercase       ) for digit in __vector]

	vector.reverse()
	for i, digit in enumerate(_lowercase       ):
		if i & 1 == 0:
			_lowercase       :							int  	=		digit * 2
			if doubled > 9:
				doubled -= 9
			check_digit += doubled
		else:
			check_digit += digit

	return check_digit % 10 == 0


if __name__ == "__main__":
		import doctest

		doctest.testmod()
		assert is_luhn('''79927398713''')
		assert not is_luhn('''79927398714''')





'''simple docstring'''

def     __UpperCamelCase					(				_lowercase = 1000       )			->      int:
	_lowercase       :							Optional[int]  	=		[0, 3, 3, 5, 4, 4, 3, 5, 5, 4, 3, 6, 6, 8, 8, 7, 7, 9, 8, 8]
	# number of letters in twenty, thirty, ..., ninety (0 for numbers less than
	# 20 due to inconsistency in teens)
	_lowercase       :							List[Any]  	=		[0, 0, 6, 6, 5, 5, 5, 7, 6, 6]

	_lowercase       :							Any  	=		0

	for i in range(1,					n + 1       ):
		if i < 1000:
			if i >= 100:
				# add number of letters for "n hundred"
				count += ones_counts[i // 100] + 7

				if i % 100 != 0:
					# add number of letters for "and" if number is not multiple
					# of 100
					count += 3

			if 0 < i % 100 < 20:
				# add number of letters for one, two, three, ..., nineteen
				# (could be combined with below if not for inconsistency in
				# teens)
				count += ones_counts[i % 100]
			else:
				# add number of letters for twenty, twenty one, ..., ninety
				# nine
				count += ones_counts[i % 10]
				count += tens_counts[(i % 100 - i % 10) // 10]
		else:
			count += ones_counts[i // 1000] + 8
	return count


if __name__ == "__main__":
		print(solution(int(input().strip())))
