s=input()
n=len(s)
s=s+s
a=-10**10
for i in range(n):
	if (s[i] not in "+-") and (s[i+n-1] not in "+-"):
		q=[""]
		for c in s[i:i+n]:
			if c in "+-":
				q+=[""]
			if c!="+":
				q[-1]+=[c]
		a=max(a,sum(int(v) for v in q))
print(a)