#yuki_27

INF=1000
v=map(int,raw_input().split())
res=INF
for a in xrange(1,31):
 for b in xrange(1,31):
  for c in xrange(1,31):
   temp=0
   for x in v:
    rtemp=INF
    for i in xrange(31):
     for j in xrange(31):
      k=x-i*a-j*b
      if k<0:
       break
      if k%c==0:
       rtemp=min(rtemp,i+j+k/c)
    temp+=rtemp
   res=min(res,temp)
print res