#!/usr/bin/python
ok = lambda x: (x[0] not in '+-') and (x[-1] not in '+-')

s = raw_input()
hamark = -float('inf')
for i in xrange(len(s)):
    x = s[i:] + s[:i]
    if ok(x):
        hamark = max(hamark, eval(x))
print hamark