$(6+8\%)()S=-{\displaystyle \underset{i}{\overset{?}{}}}{P}_{i}lo{g}_2{P}_i$ bits. $8*18(\frac{1}{2},\frac{1}{4},\frac{1}{8},\frac{1}{16},\frac{1}{64},\frac{1}{64},\frac{1}{64},\frac{1}{64})$a$-x$ bits$x?($b$)18,,x$