$${E_p = 2 \left( 2 \frac{h^2}{8mL^2} \right) + 4 \left( 5 \frac{h^2}{8mL^2} \right) + 1 \left( 8 \frac{h^2}{8mL^2} \right) \\ = \underline{\underline{32 \frac{h^2}{8mL^2}}}}$$