2020-09-14 14:34:03 +02:00
|
|
|
def alternateSum(n):
|
2020-09-14 16:36:09 +02:00
|
|
|
positiveNumbers = [
|
|
|
|
|
num**2 for num in [i for i in range(1, n + 1) if i % 2 != 0]
|
|
|
|
|
]
|
|
|
|
|
negativeNumbers = [
|
|
|
|
|
-num**2 for num in [i for i in range(1, n + 1) if i % 2 == 0]
|
|
|
|
|
]
|
2020-09-14 14:34:03 +02:00
|
|
|
return sum(positiveNumbers + negativeNumbers)
|
|
|
|
|
|
2020-09-14 16:36:09 +02:00
|
|
|
|
2020-09-14 14:34:03 +02:00
|
|
|
if __name__ == "__main__":
|
|
|
|
|
n = int(input('n: '))
|
|
|
|
|
print(alternateSum(n))
|
