B1 = 6**(64-2)
B2 = 5*6**(64-3)
B3 = ( 5 + 1 ) * 5 * 6**(64-4)
B4 = ( 5 + 2 ) * 5**2 * 6**(64-5)
B5 = ( 1 + 3*5 + 5**2 ) * 5**2 * 6**(64-6)
B6 = ( 3 + 4*5 + 5**2 ) * 5**3 * 6**(64-7)