v=list(map(int, input().split()))
m=30
INF=1000
ans=INF
import itertools
for a, b, c in itertools.combinations(range(1, m+1), 3):
    dp=[INF]*(m+1)
    dp[0]=0
    for i in range(1, m+1):
        for x in [a, b, c]:
            if i>=x:
                dp[i]=min(dp[i], dp[i-x]+1)
    ans=min(ans, sum(dp[x] for x in v))
print(ans)