Kostrub

import math

p = 20
po = 0
n = 1
p_otk = 10
while p_otk >= 0.01:
    print('n = ' + str(n))
    for k in range(n + 1):
        po += (p ** k) / (math.factorial(k))
    po = po ** (-1)
    print('p_o = ' + str(po))
    p_otk = po * ((p ** n) / (math.factorial(n)))
    print('p_otk = ' + str(p_otk))
    n += 1