from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline
INF = (1<<60)
V = list(map(int,input().split()))


ans = (1<<30)
M = 31
for i in range(1,M-1):
    for j in range(i+1,M):
        for k in range(j+1,M+1):
            mem = defaultdict(lambda:INF)
            mem[0]=0
            A = [i,j,k]
            for s in range(M):
                for a in A:
                    mem[s+a] = min(mem[s+a],mem[s]+1)
            ans = min(sum(mem[x] for x in V),ans)
print(ans)