import sequtils,bitops
template `max=`*(x,y) = x = max(x,y)
proc binary(x:int,reverse:bool=false):string =
  if x == 0 : return "0"
  result = ""
  var x = x
  while x > 0:
    result &= ('0'.ord + x mod 2).chr
    x = x div 2
  if reverse : return
  for i in 0..<result.len div 2: swap(result[i],result[result.len-1-i])
proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "<stdio.h>" .}
proc getCWW(S:seq[int]):int =
  if S.len < 3: return 0
  var ans = 0
  for a in 0..<S.len:
    if S[a] == 0  : continue
    for b in (a+1)..<S.len:
      if S[a] == S[b] : continue
      for c in (b+1)..<S.len:
        if S[b] != S[c] : continue
        let S2 = S[0..<a] & S[a+1..<b] & S[b+1..<c] & S[c+1..<S.len]
        ans .max= getCWW(S2) + (100 * S[a] + 10 * S[b] + S[c])
  return ans

var S = newSeq[int]()
while true:
  let k = getchar_unlocked()
  if k < '0': break
  S &= k.ord - '0'.ord

# var dp = newSeqWith(1 shl S.len,0)
proc bitDP(s:int) : int =
  if s.popcount() + 3 > S.len : return 0
  var ans = 0
  for a in 0..<S.len:
    let sa = 1 shl a
    if (sa or s) == s : continue
    if S[a] == 0  : continue
    for b in (a+1)..<S.len:
      let sb = 1 shl b
      if (sb or s) == s : continue
      if S[a] == S[b] : continue
      for c in (b+1)..<S.len:
        let sc = 1 shl c
        if (sc or s) == s : continue
        if S[b] != S[c] : continue
        let s2 = sa or sb or sc or s
        ans .max= 100 * S[a] + 10 * S[b] + S[c] + bitDP(s2)
  return ans
echo bitDP(0)
# echo S.getCWW()