№8 — #8117

from itertools import *
k = 0
for w in product('0123456', repeat=7):
    s = ''.join(w)
    cch = s.count('0') + s.count('2') + s.count('4') + s.count('6')
    if s[0] != '0' and cch == 2:
        k += 1
print(k)