S = input()
N = len(S)
ansl = []
for i in range(N):
    T = S[i:] + S[0:i]
    if T[0] == '+' or T[0] == '-' or T[-1] == '+' or T[-1] == '-':
        pass
    else:
        T = T.replace('+', ',').replace('-', ',-')
        A = T.split(',')
        sub = 0
        for a in A:
            sub += int(a)
        ansl.append(sub)

print(max(ansl))