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@computer-tutor
Created April 28, 2020 04:25
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n = int(input("Enter an Integer: "))
x = 0
if n > 0:
for i in range(n, 2*n+1):
x += i
else:
for i in range(2*n, n+1): # for negative n, we need to reverse start & end of range
x += i
print(x)
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