S = input()
ans_l = []

for i in range(len(S)):
    newS = S[i:] + S[:i]
    if newS[0] == "+" or newS[0] == "-":
        continue
    if newS[-1] == "+" or newS[-1] == "-":
        continue
    if "+-" in newS or "-+" in newS:
        continue
    ans_l.append(eval(newS))

print(max(ans_l))