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: # coding: UTF-8
  import sys
  #sys.setrecursionlimit(n)
  import heapq
  import re
  import bisect
  import random
  import math
  import itertools
  from collections import defaultdict, deque
  from copy import deepcopy
  from decimal import *
  
  n = int(input())
  v = list(map(int, input().split()))
  a = defaultdict(int)
  b = defaultdict(int)
  
  nn = n // 2
  for i in range(nn):
      a[v[i * 2]] += 1
      b[v[i * 2 + 1]] += 1
  
  ma1 = max(a, key=a.get)
  mb1 = max(b, key=b.get)
  mva1 = a[ma1]
  mvb1 = b[mb1]
  a[ma1] = 0
  b[mb1] = 0
  ma2 = max(a, key=a.get)
  mb2 = max(b, key=b.get)
  mva2 = a[ma2]
  mvb2 = b[mb2]
  a[ma2] = 0
  b[mb2] = 0
  
  ma = [(ma1, mva1), (ma2, mva2)]
  mb = [(mb1, mvb1), (mb2, mvb2)]
  mx = 0xFFFFFFFF
  for i in ma:
      for j in mb:
          if i[0] == j[0]:
              pass
          else:
              mx = min(sum(a.values()) + i[1] + sum(b.values()) + j[1], mx)
  if mx == 0xFFFFFFFF:
      print(0)
  else:
      print(mx
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 /\\/\\/\\/."}]