output_description: Print the minimum number of elements that needs to be replaced.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      n
      v_1 v_2 ... v_n
attempt: n = int(input())
  li_input = list(map(int, input().split()))
  
  li_ki = li_input[0::2]
  li_gu = li_input[1::2]
  
  
  li_ki_counter = sorted([(i, li_ki.count(i)) for i in set(li_ki)], key=lambda x: x[1])
  li_gu_counter = sorted([(i, li_gu.count(i)) for i in set(li_gu)], key=lambda x: x[1])
  
  
  ki_1st = li_ki_counter[0][0]
  gu_1st = li_gu_counter[0][0]
  
  if ki_1st == gu_1st:
      # 最頻値が同じ値の場合、2番目に多い要素を使う
  
      if len(li_ki_counter) == 1:
          ki_2nd = -1
      else:
          ki_2nd = li_ki_counter[1][0]
  
      if len(li_gu_counter) == 1:
          gu_2nd = -1
      else:
          gu_2nd = li_gu_counter[1][0]
  
      ptn1 = len(list(filter(lambda x: x != ki_1st, li_ki))) + len(
          list(filter(lambda x: x != gu_2nd, li_gu))
      )
      ptn2 = len(list(filter(lambda x: x != ki_2nd, li_ki))) + len(
          list(filter(lambda x: x != gu_1st, li_gu))
      )
  
      if ptn1 >= ptn2:
          print(ptn2)
      else:
          print(ptn1)
  
  else:
      # 最頻値が異なる場合
      print(
          len(list(filter(lambda x: x != ki_1st, li_ki)))
          + len(list(filter(lambda x: x != gu_1st, li_gu)))
      )
  
problem_description: Statement
  
  A sequence a_1,a_2,... ,a_n is said to be /\/\/\/ when the following
  conditions are satisfied:
  
    * For each i = 1,2,..., n-2, a_i = a_{i+2}.
    * Exactly two different numbers appear in the sequence.
  
  You are given a sequence v_1,v_2,...,v_n whose length is even. We would like
  to make this sequence /\/\/\/ by replacing some of its elements. Find the
  minimum number of elements that needs to be replaced.
samples: [{"input": "4\n    3 1 3 2", "output": "1\n    \n\nThe sequence 3,1,3,2 is not /\\/\\/\\/, but we can make it /\\/\\/\\/ by replacing\none of its elements: for example, replace the fourth element to make it\n3,1,3,1.\n\n* * *"}, {"input": "6\n    105 119 105 119 105 119", "output": "0\n    \n\nThe sequence 105,119,105,119,105,119 is /\\/\\/\\/.\n\n* * *"}, {"input": "4\n    1 1 1 1", "output": "2\n    \n\nThe elements of the sequence 1,1,1,1 are all the same, so it is not /\\/\\/\\/."}]