S = raw_input()
N = len(S)
ans = 0
for i in range(N):
	if S[i-1].isdigit() and S[i].isdigit():
		tmp = pre = 0
		op = "+"
		ns = S[i:N] + S[0:i]
		for i in range(N):
			if ns[i].isdigit():
				continue
			if op == "+":
				tmp += int(ns[pre:i])
			else:
				tmp -= int(ns[pre:i])
			op = ns[i]
			pre = i+1
		else:
			if op == "+":
				tmp += int(ns[pre:N])
			else:
				tmp -= int(ns[pre:N])
		ans = max(ans,tmp)
print ans