Calculate:  $$1 + \frac{1}{2}+ \frac{2}{2}+ \frac{1}{2}+ \frac{1}{3}+ \frac{2}{3}+ \frac{3}{3}+ \frac{2}{3}+ \frac{1}{3}+ \cdots + \frac{1}{8}+\frac{2}{8}+ \cdots + \frac{7}{8}+ \frac{8}{8}+ \frac{7}{8}+ \cdots + \frac{1}{8}=$$~\uline{~~~~~~~~~~}~ 
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