S = list(input())

n = len(S)
ans = -10**18
for i in range(n):
    T = S[i:] + S[:i]
    t = ''.join(T)
    res = 0
    flag = True
    num = '0'
    if t[0] in ['+', '-'] or t[-1] in ['+', '-']:
        continue
    t = '+' + t
    for tt in t:
        if tt == '-' or tt == '+':
            if flag:
                res += int(num)
            else:
                res -= int(num)
            num = ''
            if tt == '+':
                flag = True
            else:
                flag = False
        else:
            num += tt
    if flag:
        res += int(num)
    else:
        res -= int(num)
    ans = max(ans, res)
print(ans)