[anonaoeu]

I find binary the easiest. You can get to 2^10 = 1024 easily.

[pjscott]

1023, if you're using the natural representation of zero.

[veli_joza]

If you raise and lower your arm, that's two more bits for total of 4096.

[Nexxxeh]

I can do it, but holding the middle finger down while the surrounding fingers are up is not comfortable.

[fsiefken]

cognitive load would be higher