from cva import COLOR_BGR2GRAY, cvtColor, imread, imshow, waitKey
from numpy import divide, inta, multiply, ravel, sort, zeros_like







def  __lowerCAmelCase							(						__SCREAMING_SNAKE_CASE    : Optional[Any]						,				__SCREAMING_SNAKE_CASE    : Union[str, Any]=3					):







    '''simple docstring'''
    __snake_case    :							Dict             =  int(mask / 2					)
    # copy image size
    __snake_case    :							Union[str, Any]             =  zeros_like(SCREAMING_SNAKE_CASE__					)
    for i in range(SCREAMING_SNAKE_CASE__						,				gray_img.shape[0] - bd					):
        for j in range(SCREAMING_SNAKE_CASE__						,				gray_img.shape[1] - bd					):
            # get mask according with mask
            __snake_case    :							Optional[int]             =  ravel(gray_img[i - bd : i + bd + 1, j - bd : j + bd + 1]					)
            # calculate mask median
            __snake_case    :							str             =  sort(SCREAMING_SNAKE_CASE__					)[inta(divide((multiply(SCREAMING_SNAKE_CASE__						,				SCREAMING_SNAKE_CASE__					))						,				2					) + 1					)]
            __snake_case    :							Union[str, Any]             =  median
    return median_img


if __name__ == "__main__":
     # read original image
     lowercase_   				=       imread("../image_data/lena.jpg")
     # turn image in gray scale value
     lowercase_   				=       cvtColor(img, COLOR_BGR2GRAY)

     # get values with two different mask size
     lowercase_   				=       median_filter(gray, 3)
     lowercase_   				=       median_filter(gray, 5)

     # show result images
     imshow("median filter with 3x3 mask", medianaxa)
     imshow("median filter with 5x5 mask", medianaxa)
     waitKey(0)







from __future__ import annotations


class        A_					:




      '''simple docstring'''


      def __init__(				self:       Union[str, Any]						,      a:       int				):
       __lowerCamelCase		:							List[Any]							=						data
       __lowerCamelCase		:							Optional[Any]							=						None



class        A_					:




      '''simple docstring'''


      def __init__(				self:       Dict				):
       __lowerCamelCase		:							Dict							=						None




      def      _snake_case	(				self:       Dict						,      a:       int				):
       __lowerCamelCase		:							List[Any]							=						Node(a				)
       __lowerCamelCase		:							Dict							=						self.head
       __lowerCamelCase		:							Optional[int]							=						new_node
       return self.head.data




      def      _snake_case	(				self:       Optional[Any]				):
       __lowerCamelCase		:							Union[str, Any]							=						self.head
       __lowerCamelCase		:							List[Any]							=						self.head
       if self.head:
        while fast_pointer and fast_pointer.next:
         __lowerCamelCase		:							Any							=						fast_pointer.next.next
         __lowerCamelCase		:							str							=						slow_pointer.next
        return slow_pointer.data
       else:
        print('No element found.'				)
        return None


if __name__ == "__main__":
       lowercase_           =	LinkedList()
       for _ in range(int(input().strip())):
              lowercase_           =	int(input().strip())
              link.push(data)
       print(link.middle_element())

