s = gets.chomp
maxi = -100000000
s.length.times { |i|
	if s[i] == '+' || s[i] == '-' || s[i - 1] == '+' || s[i - 1] == '-'
		next
	end
	maxi = [maxi, eval(s[i,s.length] + s[0,i])].max
}
puts maxi