At market close:
x will be the integer part of the percentage of this market
p will be the closest prime to the numer of shareholders*

The market resolves according to the value Legendre(x,p):

1: resolves YES,

-1: resolves NO,

0: resolves N/A

For the definition, you can check https://en.wikipedia.org/wiki/Legendre_symbol

*in case of a tie, i'll choose the smaller one (for example, if there are 42 shareholders, i'll choose p=41)