Задание 9

e = float(input())
i = 1
a = float(-1)
s = 0
f = 1
while abs(round(a / f, 30)) > e:
    s += round(a / f, 30)
    a *= -1
    i += 1
    f = 1
    for j in range(1, 2 * i):
        f *= j
print(s)