import sys
read=sys.stdin.buffer.read
readline=sys.stdin.buffer.readline

V=list(map(int,readline().split()))
from itertools import combinations
def solve(A, B, C):
    INF=10**9
    dp=[INF]*31
    dp[0]=0
    for val in [A, B, C]:
        for n in range(31-val):
            dp[n+val]=min(dp[n+val], dp[n]+1)
    return sum(dp[v] for v in V)

ans=min(solve(A, B, C) for (A,B,C) in combinations(range(1,31), 3))
print(ans, flush=True)