s = raw_input()
n = len(s)
s = s + s
best = -999999999
for i in xrange(n):
	t = s[i:i + n]
	if t[0] == '+' or t[0] == '-' or t[-1] == '+' or t[-1] == '-':
		continue
	best = max(best, eval(t))
print best;