s = gets.strip
len = s.length
n = 0
op = ""
sum = 0
i = 0
len.times do
    if s[i] == "+" || s[i] == "*"
        op = s[i]
        i += 1
        break
    end
    sum *= 10
    sum += s[i].to_i
    i += 1
end
i.upto(len - 1) do |j|
    c = s[j]
    if c == "+" || c == "*"
        if op == "+"
            sum *= n
        elsif op == "*"
            sum += n
        end
        op = c
        n = 0
    else
        n *= 10
        n += c.to_i
    end
end
if op == "+"
    sum *= n
elsif op == "*"
    sum += n
end
puts sum