import sequtils,strutils,algorithm,math,future,macros
template get*():string = stdin.readLine().strip()
template `min=`*(x,y:typed):void = x = min(x,y)

let V = get().split().map(parseInt).sorted(cmp) # 4 * [1,30]
const INF = 1e6.int
var ans = INF
# 30 * 30 * 30
for A in 1..V.max():
  for B in 1..A:
    for C in 1..B:
      var dp = newSeqWith(V.max()+1,INF) # v を ABC で 作るのに掛かるコストの最小値
      dp[0] = 0
      for v in 0..V.max()-A:
        if dp[v] != INF: dp[v + A] .min= dp[v] + 1
      for v in 0..V.max()-B:
        if dp[v] != INF: dp[v + B] .min= dp[v] + 1
      for v in 0..V.max()-C:
        if dp[v] != INF: dp[v + C] .min= dp[v] + 1
      ans .min= V.mapIt(dp[it]).sum()
echo ans