a)how i can to go fast when push the button of below code:

Button UP,1,10,2,b1,1,MONTE ' button UP
Button DOWN,1,10,2,b2,1,DESCEND 'button DOWN

b)how i can to write this code which is for 50

F3=50*(F1//16) 'this work

to make for 62,5 , like this :

F3=62,5*(F1//16) 'this don't work