Dear friend, there are many ways of skinning a rat. The single fact is that the cat always gets skinned. So look at this. A finger (1), fingers (more than one), hand. Its also important to note that a thumb is also a finger for that matter. (accounting philosophy - for more about numbers you can contact me on email@example.com)
The starting number s zero if you want to take all fingers as a hand.
They can also be zero because they seem to be for one person (basing on what paring idea)
One finger if you make a pair of four fingers leaving only one finger unpaired.
You can also say two fingers. Pair fingers on the hand into two and remain with only one (Finger).
If you pair three and two finger - you get two fingers without a balance.
They can also be five fingers because you have a collection of five fingers
Remember one plus one is always two but one plus one can also be one in marriage yet it can also be three (with of spring) or even infinite with uncountable numbers depending on the number of off springs.