14 52025 + 5400 – х

#14 https://kpolyakov.spb.ru/school/ege/gen.php?action=viewVar&answers=on&varId=2
n = 5 ** 8
answ = (0, 0) #кол-во четверок, x
for x in range(10, 70001):
    r = n - x
    cnt = 0
    while r != 0:
        if r % 5 == 4:
            cnt += 1
        r //= 5
    answ = max(answ, (cnt, x))
print(answ)