def cylinder array
    tmp = array.shift
    array.push(tmp)
end

s = gets.chomp
ans = []
a = s.split('')
a.size.times{
    if a[0] =~ /[^+\-]/ && a[-1] =~ /[^+\-]/
        ans.push(eval(a.join('')))
    end
    cylinder(a)
    }
p ans.max