What exactly do you think this label is attempting to convey?
An unexpected value?
A rule-breaking, iconoclastic Spanish bubbly?
A jab at arithmetic?
A very poor 1st grade teacher?
Would that this mathematical expression equated to super tasting value Cava. 1+1=3 is a very serviceable sparkling wine. However, at $13, I'll take the S to the V at ninedamndollars (or $6!) every day of the week. It's just as good, and to my palate, it offers a bit more yeasty/toasty goodness. However, if you're a grade school teacher, you may feel compelled to buy every bottle of "1-plus" in the store just so you can correct the label.
A more apt & honest label.