Heart to heart... From the father with many children, for you-young parents. When children are small, diapers leave at the speed of a machine-gun tape. And your head full the correct feeding-bathing-festivals. And the schedule of vaccinations, promotions in children's stores. And you sleepy...very...very... And it is a pity to spend time to consider what diapers to buy more profitable, and that you took the last time. And to make life a little easier for you (and based on my personal experience - as the Pope of three cheerful toddler), I wrote a small calculator that will calculate which pack of diapers is most beneficial. And they will remember what and how much you bought last time, so as not to clog the head.