V=map(int,raw_input().split())

ans = 150
for i in range(1,31):
   for j in range(i+1,31):
      for k in range(j+1,31):
         cnt = [500 for l in range(100)]
         cnt[0]=0
         for l in range(31):
            if cnt[l] != 500 :
               cnt[l+i] = min(cnt[l+i],cnt[l]+1)
               cnt[l+j] = min(cnt[l+j],cnt[l]+1)
               cnt[l+k] = min(cnt[l+k],cnt[l]+1)
         curCnt = 0
         for v in V:
            curCnt += cnt[v]
         ans = min(ans,curCnt)
print ans