V=[int(i) for i in input().split()]
import itertools
inf=float("inf")
ans=inf
for A in itertools.combinations(range(1,31),3):
  D=[0]+[inf]*30
  for i in range(1,31):
    for a in A:
      if i>=a:
        D[i]=min(D[i],D[i-a]+1)
  ans=min(ans,sum(D[v] for v in V))
print(ans)