




'''simple docstring'''







from collections import Counter






def 		_lowercase		(	lowercase_  ):



		'''simple docstring'''







		return sum(socks_by_color // 2 for socks_by_color in Counter(lowercase_  ).values()  )


if __name__ == "__main__":
						import doctest

						doctest.testmod()

						_lowerCamelCase							:						Tuple								=  [int(x) for x in input('Enter socks by color :').rstrip().split()]
						print(F'''sock_merchant({colors}) = {sock_merchant(colors)}''')











'''simple docstring'''







def 		_lowercase		(	lowercase_  ):



		'''simple docstring'''







		return "".join(chr(ord(lowercase_  ) + 32  ) if "A" <= char <= "Z" else char for char in word  )


if __name__ == "__main__":
						from doctest import testmod

						testmod()





