a) not clear to me what you want??
b)
F3=62,5*(F1//16) 'this don't work
PBP supports integers only...
try
F3=125*(F1//16)/2
or
F3=(125*(F1//16))>>2

check your answers to make sure you can live with the roundoff (e.g., if F1=17 then F3 will be 62 not 62,5.)

Paul Borgmeier
Salt Lake City, Utah
USA