from re import findall

def calc(s):
    ts = findall('\+|\-|\d+', s)
    if ts[0] == '+' or ts[0] == '-':
        return None
    acc = int(ts[0])
    ts = ts[1:]
    while ts:
        if len(ts) == 1:
            return None
        if ts[0] == '+':
            acc += int(ts[1])
        else:
            acc -= int(ts[1])
        ts = ts[2:]
    return acc

S = raw_input()
ss = [(S+S)[i:i+len(S)] for i in range(len(S))]
print(max(calc(s) for s in ss))