This is a question I found on the book and I don't know how to tackle it. Thanks to any help or hint in advance.

I have a coin that, I could get the head 100% at the first flip, $\frac{1}{3}$ at the second flip, $\frac{1}{5}$ at the third flip ...... $\frac{1}{2i - 1}$ at the $i^{th}$ flip.

Suppose I would get a point when I get 4 consecutive flips (4 heads or 4 tails). If I flip 100 times, what is the expected number of the points I would get?