[Python] How can I correctly calculate the sum of all numbers in a range in a while loop?

I am trying to calculate, using a while loop, the sum of all numbers from 20 to 100. It calculates, but I am 100% sure it is wrong.

My code is:

num = 20
sum = 0
i = 0
while num <= 100:
for i in range(0, num + 1):
sum = num + 1
num = num + 1
continue

print(sum)


The result is 167. But I know it has to be 210.

I tried various changes: for example, changed the position of num = num + 1 to after the for loop, but it does not work properly.

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