tsk 18

for i in range(4**8, 0, -1):
    x, l, m = i, 0, 0
    while x > 12: # x * 4**8 // 4**7 > 12, x == 4
        l += 1
        x //= 4
    m = x
    if l > m:
        l, m = m, l
    if l == 3 and m == 7:
        print(i)
        break