help with series

Compute the sum
1 + \frac{1}{5} + \frac{2}{5} + \frac{3}{5} + \frac{4}{5} + \frac{1}{25} + \frac{2}{25} + \frac{3}{25} + \frac{4}{25} + \frac{5}{125} + \frac{6}{125} + \frac{7}{125} + \frac{8}{625}