Keep up at the back!
You cant add 1 to nothing!
Because you have nothing to add to.
20 + 20 = 40
40 x 0 = 0
0 + 1 = 0
Remember forum friends, if you are out tonight and have had say, 0 pints, that if you go to the bar and get yourself 1 pint, that you then proceed to drink, you will honestly have then had in total, 1 pint. Not 0, definitely not.