for n in range(1, 1000):
    n_2 = bin(n)[2:]
    if int(n_2) % 2 == 0:
        n_2 = n_2 + '10'
    else:
        n_2 = '1' + n_2 + '01'
        R = int(n_2 , 2)
    if R > 441:
        print(n)
        break