Python program to Get Sum of N Series of an Element

#1,-0.5,0.25,-0.125...
x = int(input("Insert number of elements in the series: "))
y = 1
z = 0
sum = 0
while z < x:
 sum += y
 y = y/-2
 z += 1
print(sum)

Output:

Insert number of elements in the series: 789
0.6666666666666667

Insert number of elements in the series: 254
0.6666666666666667

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