S = input()
ans = -1 << 30
for _ in range(10):
    if S[0].isdigit() and S[-1].isdigit():
        tmp = 0
        ope = "+"
        T = ""
        for s in S:
            if s.isdigit():
                T += s
            else:
                if ope == "+":
                    tmp += int(T)
                else:
                    tmp -= int(T)
                ope = s
                T = ""
        if ope == "+":
            tmp += int(T)
        else:
            tmp -= int(T)
        ope = s
        ans = max(ans, tmp)
    S = S[1:] + S[0]
print(ans)