Problem 3 Final

n = 10000
while n>=1:
    a=(1/-2*n+1)
    b=(1/2*n)
    print(a)
    print(b)
else n>=0:
    c=(1/2*n+1)
    d=(1/-2*n)
    print(c)
    print(d)
a+b+c+d
#I'm having a few issues with this, I'm attaching some of my written work to show I solved it. I understand how this works, and this can be broken down into four parts that combine together to form a whole series.
#https://drive.google.com/file/d/0By4QogT9U6sTVVBSV3dEMS1RQWc/view?usp=sharing
#https://drive.google.com/file/d/0By4QogT9U6sTU0l3ZFFiQUZmeW8/view?usp=sharing