def calc(V, A, B, C):
    ret = float('inf')
    for i in range(V//A+1):
        for j in range(V//B+1):
            t = V - A*i - B*j
            if t < 0:
                break
            if t % C == 0:
                ret = min(ret, i + j + t // C)
    return ret

V = list(map(int, input().split()))
ans = float('inf')
for A in range(1, 31):
    for B in range(A + 1, 31):
        for C in range(B + 1, 31):
            ans = min(ans, sum(calc(v, A, B, C) for v in V))
print(ans)