from visual import *
from __future__ import division

# constants
L = ???             ## see problem statement
N = 8               ## to begin witgh; you will change it later
Q = ???             ## see problem statement
oofpez = 9e9
scalefactor = 1.0   ## not the correct value; you will change it later
deltax = ???        ## use your symbolic expression
deltaQ = ???        ## use your symbolic expression


# initial values

x = ???


# first loop

while x < ???:
    sphere(pos = ??? ...) 
    # now add the appropriate constant to x to get the position of the next sphere
    x = x + ???

# second loop