Hi. I have a question. What indicates the numbers 1-7? Is 7 the coldest value or is 1 the coldest value? I'm from Europe and in Europe the numbers usually indicates the degree in celsius. But now I'm currently living in Hawaii and that makes me unsecure about whether it's the same as in Europe. Which level do you suggest I have my refrigerator on if I want my food to stay fresh? I have a magic chef refrigerator model: MCBR445W1