text: import sys
  import re
  import math
  from collections import *
   
  n = int(input())
   
  if n == 1:
      print(1)
   
  elif n < 4:
      print('NO SOLUTION')
   
  else:
      for i in range(2, n+1, 2):
          print(i)
      for i in range(1, n+1, 2):
          print(i)
  