Ryu said:
A 100x100 castle has 84 walls, 4 gates and 12 turrets
That is:
84x walls (400) = 33600
4x gate (960) = 3840
12x turret (640) = 7680
Without money most will not see the day of complete level 5 walls, so if you want to complete the circle, maybe start with something not as expensive. Lots of level 1 walls with the best turrets and gates
88 walls, not 84 .... there are 22 walls on each side
Buying low level walls is a scam
It is often cheaper to destroy our existing walls and buy new, than to upgrade our existing walls
so we have wasted many sapphires buying low level fortification units
I have always hated the way that plarium refuse to offer discounts on wall upgrades.