#!/usr/bin/env python3
import sys
input = sys.stdin.readline
from itertools import combinations

v = [int(item) for item in input().split()]
v.sort()
base = [item for item in range(1, 31)]
ans = sum(v)
for comb in combinations(base, 3):
    if v[0] < comb[0]:
        continue
    dp = [50] * (30 + 1)
    dp[0] = 0
    for i in range(30):
        for item in comb:
            if i + item <= 30:
                dp[i + item] = min(dp[i+item], dp[i] + 1) 
    ret = 0
    for item in v:
        ret += dp[item]
    ans = min(ans, ret)

print(ans)