

def 						_snake_case(    SCREAMING_SNAKE_CASE__			:	int = 1000      )							->      int:





    '''simple docstring'''






    A__          =   2**power
    A__          =   0
    while n:
        A__      ,						A__          =   r + n % 10, n // 10
    return r


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





'''simple docstring'''


import os
import sys
from contextlib import contextmanager


# Windows only
if os.name == "nt":
				import ctypes
				import msvcrt  # noqa





				class     lowercase__  (						ctypes.Structure					):





											'''simple docstring'''


											A_							:      Optional[Any]      	=  [("""size""", ctypes.c_int), ("""visible""", ctypes.c_byte)]







def 			snake_case_   (  ):







				"""simple docstring"""





				if os.name == "nt":
								_SCREAMING_SNAKE_CASE :       Tuple     		=      CursorInfo()
								_SCREAMING_SNAKE_CASE :       Tuple     		=      ctypes.windll.kernelaa.GetStdHandle(-11     )
								ctypes.windll.kernelaa.GetConsoleCursorInfo(SCREAMING_SNAKE_CASE__							,      ctypes.byref(SCREAMING_SNAKE_CASE__     )     )
								_SCREAMING_SNAKE_CASE :       Optional[Any]     		=      False
								ctypes.windll.kernelaa.SetConsoleCursorInfo(SCREAMING_SNAKE_CASE__							,      ctypes.byref(SCREAMING_SNAKE_CASE__     )     )
				elif os.name == "posix":
								sys.stdout.write("""\033[?25l"""     )
								sys.stdout.flush()







def 			snake_case_   (  ):







				"""simple docstring"""





				if os.name == "nt":
								_SCREAMING_SNAKE_CASE :       int     		=      CursorInfo()
								_SCREAMING_SNAKE_CASE :       List[str]     		=      ctypes.windll.kernelaa.GetStdHandle(-11     )
								ctypes.windll.kernelaa.GetConsoleCursorInfo(SCREAMING_SNAKE_CASE__							,      ctypes.byref(SCREAMING_SNAKE_CASE__     )     )
								_SCREAMING_SNAKE_CASE :       Tuple     		=      True
								ctypes.windll.kernelaa.SetConsoleCursorInfo(SCREAMING_SNAKE_CASE__							,      ctypes.byref(SCREAMING_SNAKE_CASE__     )     )
				elif os.name == "posix":
								sys.stdout.write("""\033[?25h"""     )
								sys.stdout.flush()







@contextmanager
def 			snake_case_   (  ):







				"""simple docstring"""





				try:
								hide_cursor()
								yield
				finally:
								show_cursor()




