Customer will select from a drop down list in B16. In E16 they can type in a size for that product that was specified in B16 but there is a minimum size for each product. I want to automaticallly bump that number up to the minimum required. 
For example, if they choose Duvets or Shams or Drapes in B16, the minimum size they can specify is 1. So if they type in 0.5, I want to bump that number up to 1 automatically.
If they choose Comforter or Comforter Sets, the minimum size they can specify is 3. So if they type in 2, I want to bump that number up to 3 automatically.
I don't want #VALUE! to show in the blank field.
Help?

For example, if they choose Duvets or Shams or Drapes in B16, the minimum size they can specify is 1. So if they type in 0.5, I want to bump that number up to 1 automatically.
If they choose Comforter or Comforter Sets, the minimum size they can specify is 3. So if they type in 2, I want to bump that number up to 3 automatically.
I don't want #VALUE! to show in the blank field.
Help?