S = input()
N = len(S)
operator = {"+", "-"}
ans = -10 ** 10
for i in range(N):
    S = S[1:] + S[:1]
    if S[0] in operator:
        continue
    if S[-1] in operator:
        continue
    T = S[:] + "+"
    i = 0
    now = 0
    tmp = 0
    op = "+"
    while i <= N:
        if T[i] not in operator:
            tmp *= 10
            tmp += int(S[i])
        else:
            if op == "+":
                now += tmp
            else:
                now -= tmp
            tmp = 0
            op = T[i]
        i += 1
    ans = max(ans, now)
print(ans)