


'''simple docstring'''


import math


def       snake_case_       (  SCREAMING_SNAKE_CASE__					):







				"""simple docstring"""





				if not isinstance(SCREAMING_SNAKE_CASE__							,				SCREAMING_SNAKE_CASE__					):
								_SCREAMING_SNAKE_CASE			:	List[Any]							=				f"""Input value of [number={number}] must be an integer"""
								raise TypeError(SCREAMING_SNAKE_CASE__					)
				if number < 1:
								_SCREAMING_SNAKE_CASE			:	List[Any]							=				f"""Input value of [number={number}] must be a positive integer"""
								raise ValueError(SCREAMING_SNAKE_CASE__					)
				_SCREAMING_SNAKE_CASE			:	Any							=				[number]
				while number != 1:
								if number % 2 == 0:
												_SCREAMING_SNAKE_CASE			:	Dict							=				math.floor(math.sqrt(SCREAMING_SNAKE_CASE__					)					)
								else:
												_SCREAMING_SNAKE_CASE			:	List[Any]							=				math.floor(
												    math.sqrt(SCREAMING_SNAKE_CASE__					) * math.sqrt(SCREAMING_SNAKE_CASE__					) * math.sqrt(SCREAMING_SNAKE_CASE__					)					)
								sequence.append(SCREAMING_SNAKE_CASE__					)
				return sequence


if __name__ == "__main__":
				import doctest

				doctest.testmod()








'''simple docstring'''


def       snake_case_       (  SCREAMING_SNAKE_CASE__ = 1000					):







				"""simple docstring"""





				_SCREAMING_SNAKE_CASE			:	Union[str, Any]							=				[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)
				_SCREAMING_SNAKE_CASE			:	str							=				[0, 0, 6, 6, 5, 5, 5, 7, 6, 6]

				_SCREAMING_SNAKE_CASE			:	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())))




