e-ly

c1.py

def R(n):
    fact = 1
    for i in range (1, n+1):
        fact = fact * i

    res = 0
    for c in str(fact):
        res += int(c)
    return res

i = 0
while True:
    val = R(i)
    if val == 8001:
        print("i=" + str(i) + " ; val = " + str(val))
        break
    i += 1

c2.py

import numpy

f = open("html_2.txt", "r")
if f:
    cont = f.read()

    level = 0
    buff = ""
    ps = []

    for i in range(0, len(cont)):
        c = cont[i]
        if c == "<":
            buff = ""
        elif c == ">":
            if buff[0] == "/":
                level -= 1
            else:
                if buff == "p":
                    ps.append(level)
                level += 1
        else:
            buff += c

    print(round(numpy.std(ps),1))

    f.close()

c3.py

tot = 0

for i in range (1, 901):
    tot += 1/i

half = 0.5 * tot
tot = 0
for i in range(1, 901):
    tot += 1/i
    if tot > half:
        print(i)
        break