V = list(map(int, input().split()))

def f(A):
    inf = 10 ** 18
    pre = [inf] * 31
    pre[0] = 0
    for i in range(3):
        dp = [inf] * 31
        for j in range(31):
            dp[j] = pre[j]
            if j - A[i] >= 0:
                dp[j] = min(dp[j], dp[j - A[i]] + 1)
        dp, pre = pre, dp
    return pre

ans = 10 ** 18
for a in range(1, 31):
    for b in range(a, 31):
        for c in range(b, 31):
            D = f([a, b, c])
            temp = 0
            for v in V:
                temp += D[v]
            ans = min(ans, temp)


print(ans)