s = gets.chomp
n = s.size
n.times do |i|
  s += s[i]
end

ans = 0

n.times do |i|
  begin
    t = s[i,n]
    next if t[0] == "+"
    next if t[0] == "-"
    next if t[-1] == "+"
    next if t[-1] == "-"
    ans = [ans,eval(t)].max
  rescue SyntaxError => s
  end
end

puts ans