Yes you're right, I forgot to include that in the calculation. Sorry for the confusion.
That means it changes to:
1st day: 1 Magic Plus, 4 discounted tickets, cost 156
2nd day: 1 Magic Plus, 1 discounted tickets, 3 regular tickets (79,20 each), cost 276,60
3rd day: 1 Magic Plus, 4 regular tickets, cost 4 times 97,20=316,80.
You could also buy 4 Discovery annual passes, that'll cost you 4 times 149 = 596. Saves you 153,40 plus the hassle of buying tickets every morning. The Discovery has a 2 day blackout after purchase but you could avoid that by buying it via mail (just send all the stuff to France and they will send you the annual passes back which means the 2 day blackout has been over before you even get the tickets).
That also leaves the option open of going for another trip.
The Discovery has selected validity dates, which you can see here: https://www.discoverthemagic.nl/content/downloads/disneyland-paris/dlp-jaarkaarten-blockdagen-discovery-mrt2018-sep2019.pdf
The dark dates are the dates the pass is valid.
The Magic plus does come with free parking and discount in shops, but since you already bought that one you get that anyway (assuming you travel in one car).
I am planning on visiting the park on 30th May 1st and 2nd of June.
Doesnt the magic plus also include 20% off full price tickets after using my five discounted tickets and also comes with free parking, which saves 25 a day, and discount it in restaurants and shops.