#!/usr/bin/env ruby

data = File.read("data.txt")

valid = data.scan(/(mul\(\d+,\d+\)|don't\(\)|do\(\))/)
p valid
sum = 0;

act = true
ops = valid.map do |operation|
  if operation[0] == "don't()"
    act = false
    0
  elsif operation[0] == "do()"
    act = true
    0
  elsif act
    operation[0].gsub(/[^\d*,]/, "").to_s.split(",").map(&:to_i).reduce(&:*)
  else
    0
  end
end

p ops.sum