def calc(S):
    ANS=0

    X=["+"]
    while S:
        if S[0]=="+" or S[0]=="-":
            X.append(S[0])
            S=S[1:]
            continue
        for i in range(len(S)):
            if S[i]=="+" or S[i]=="-":
                X.append(int(S[:i]))
                S=S[i:]
                break
        else:
            X.append(int(S))
            break

    for i in range(len(X)):
        if X[i]=="+":
            ANS+=X[i+1]
        elif X[i]=="-":
            ANS-=X[i+1]
    return ANS

S=input()
MAX=-1<<60
for i in range(len(S)):
    #print(S)

    if S[0] in "+-" or S[-1] in "+-":
        True
    else:
        MAX=max(MAX,calc(S))

    S=S[1:]+S[0]

print(MAX)