[Python] Trying to write a program in python that determines how many pyramids can be built...

basically if there are 3 blocks the program should say 2 layers - 2 blocks on the bottom and then 1 on the top (total 3 blocks used)

if there are 6 bricks available then the program should say 3 layers - 3 blocks on the bottom, 2 above it, and then 1 on the top

if there are 7 bricks available then the program should also be 3 layers - 3 blocks on the bottom, 2 above it, and then 1 on the top, 1 left over which is not enough for a new layer

i've got it working however for some reason it acts strange when I put in 20 bricks, where it gives me a negative number and increases the layer,

I fixed this with an if statement, but I do not understand why this is happening, could use some advice. Thanks

blocks = int(input("Enter the number of blocks: "))
layer = 0
layer_count = 0

while blocks >= layer:

layer = layer + 1
blocks = blocks - layer
layer_count = layer_count + 1

print('blocks needed for layer is', layer)
print('blocks remaining are', blocks)
print('number of layers completed is', layer_count)
print()
if blocks < 0:
layer_count = layer_count - 1


print('Final count is', layer_count)

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