s = input()


def calc(s: str):
    if s[0] in {"+", "-"} or s[-1] in {"+", "-"}:
        return -float("INF")
    else:
        res = 0
        for c in s.split("+"):
            if "-" in c:
                a, *b = c.split("-")
                c = int(a) - sum(map(int, b))
            res += int(c)
        return res


ans = -float("INF")
for i in range(len(s)):
    ans = max(ans, calc(s))
    s = s[1:] + s[0]

print(ans)