text: r=[int(x) for x in input('Enter numbers seprated by space: ').split()]
  c=[]
  s=0
  for i in range(len(r)):
      for j in range(i+1,len(r)):
          c.append((r[i],r[j]))
  for i in range(int(len(c))):
      a = min(c[i])+min(c[len(c)-i-1])
      if(a>s):
          s=a
  print(s)
  