INF = 1 << 60


def calc(a, b, c, x):
    dp = [INF] * 31
    for s in [a, b, c]:
        dp[s] = 1
        for t in range(s+1, x+1):
            dp[t] = min(dp[t], dp[t-s] + 1)
    return dp[x]


v = list(map(int, input().split()))
ans = INF
for i in range(1, 31):
    for j in range(1, 31):
        for k in range(1, 31):
            ans = min(ans, sum(calc(i, j, k, x) for x in v))
print(ans)