Fast Human Calculator

I think Japan is a great country to work at because they trained their staff so well that they can go beyond average human ability. Long before i posted a video about a woman who worked in a bank manage to stamp in crazy speed without mistake. This time another woman who i think also work in a bank can add numbers using ordinary calculator in a rather unique way and speed. You might be amazed from the first half of the video, wait till you watch till the end!