N=int(input())
try:
  A=[int(input()) for _ in range(N)]
  AA=sorted(A)
  a=AA[0]+AA[1]
  b=AA[0]+AA[2]
  c=AA[1]+AA[2]
  if b!=c:
    print(b)
  else:
    print(a)
except:
  print('"assert"')