from itertools import product

alph = '0123456789ABCDEF'
xy = 0

for x, y in product(alph, repeat=2):
    n = int(f'27A{x}23', 16) + int(f'8{y}E5D2', 16)
    if n % 5 == 0:
        xy = max(xy, int(x, 16) + int(y, 16))

print(xy)
