S=input()
N=len(S)

X=-1
for _ in range(N):
    F=1
    for i in range(N-1):
        if S[i:i+2] in {"++","+-","-+","--"}:
            F=0
    if {S[0],S[-1]} & {"+","-"}:
        F=0
    if F:X=max(X,eval(S))
    S=S[-1]+S[:-1]
print(X)